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diff --git a/libjava/classpath/javax/sound/midi/Sequence.java b/libjava/classpath/javax/sound/midi/Sequence.java
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+/* Sequence.java -- A sequence of MIDI events
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.sound.midi;
+
+import java.util.Iterator;
+import java.util.Vector;
+
+/**
+ * Objects of this type represent sequences of MIDI messages that can be
+ * played back by a Sequencer.
+ *
+ * @author Anthony Green (green@redhat.com)
+ * @since 1.3
+ *
+ */
+public class Sequence
+{
+  /**
+   * The timing division type for this sequence (PPQ or SMPTE*)
+   */
+  protected float divisionType;
+
+  /**
+   * The timing resolution in ticks/beat or ticks/frame, depending on the
+   * division type.
+   */
+  protected int resolution;
+
+  /**
+   * The MIDI tracks used by this sequence.
+   */
+  protected Vector<Track> tracks;
+
+  /**
+   * Tempo-based timing.  Resolution is specified in ticks per beat.
+   */
+  public static final float PPQ = 0.0f;
+
+  /**
+   * 24 frames/second timing.  Resolution is specific in ticks per frame.
+   */
+  public static final float SMPTE_24 = 24.0f;
+
+  /**
+   * 25 frames/second timing.  Resolution is specific in ticks per frame.
+   */
+  public static final float SMPTE_25 = 25.0f;
+
+  /**
+   * 30 frames/second timing.  Resolution is specific in ticks per frame.
+   */
+  public static final float SMPTE_30 = 30.0f;
+
+  /**
+   * 29.97 frames/second timing.  Resolution is specific in ticks per frame.
+   */
+  public static final float SMPTE_30DROP = 29.97f;
+
+  // Private helper class
+  private void init(float divisionType, int resolution, int numTracks)
+    throws InvalidMidiDataException
+  {
+    if (divisionType != PPQ
+        && divisionType != SMPTE_24
+        && divisionType != SMPTE_25
+        && divisionType != SMPTE_30
+        && divisionType != SMPTE_30DROP)
+      throw new InvalidMidiDataException("Invalid division type ("
+                                         + divisionType + ")");
+
+    this.divisionType = divisionType;
+    this.resolution = resolution;
+
+    tracks = new Vector<Track>(numTracks);
+    while (numTracks > 0)
+      tracks.set(--numTracks, new Track());
+  }
+
+  /**
+   * Create a MIDI sequence object with no initial tracks.
+   *
+   * @param divisionType the division type (must be one of PPQ or SMPTE_*)
+   * @param resolution the timing resolution
+   * @throws InvalidMidiDataException if the division type is invalid
+   */
+  public Sequence(float divisionType, int resolution)
+    throws InvalidMidiDataException
+  {
+    init(divisionType, resolution, 0);
+  }
+
+  /**
+   * Create a MIDI seqence object.
+   *
+   * @param divisionType the division type (must be one of PPQ or SMPTE_*)
+   * @param resolution the timing resolution
+   * @param numTracks the number of initial tracks
+   * @throws InvalidMidiDataException if the division type is invalid
+   */
+  public Sequence(float divisionType, int resolution, int numTracks)
+    throws InvalidMidiDataException
+  {
+    init(divisionType, resolution, 0);
+  }
+
+  /**
+   * The division type of this sequence.
+   *
+   * @return division type of this sequence
+   */
+  public float getDivisionType()
+  {
+    return divisionType;
+  }
+
+  /**
+   * The timing resolution for this sequence, relative to the division type.
+   *
+   * @return the timing resolution for this sequence
+   */
+  public int getResolution()
+  {
+    return resolution;
+  }
+
+  /**
+   * Create a new empty MIDI track and add it to this sequence.
+   *
+   * @return the newly create MIDI track
+   */
+  public Track createTrack()
+  {
+    Track track = new Track();
+    tracks.add(track);
+    return track;
+  }
+
+  /**
+   * Remove the specified MIDI track from this sequence.
+   *
+   * @param track the track to remove
+   * @return true if track was removed and false othewise
+   */
+  public boolean deleteTrack(Track track)
+  {
+    return tracks.remove(track);
+  }
+
+  /**
+   * Get an array of MIDI tracks used in this sequence.
+   *
+   * @return a possibly empty array of tracks
+   */
+  public Track[] getTracks()
+  {
+    return tracks.toArray(new Track[tracks.size()]);
+  }
+
+  /**
+   * The length of this sequence in microseconds.
+   *
+   * @return the length of this sequence in microseconds
+   */
+  public long getMicrosecondLength()
+  {
+    long tickLength = getTickLength();
+
+    if (divisionType == PPQ)
+    {
+      // FIXME
+      // How can this possible be computed?  PPQ is pulses per quarter-note,
+      // which is dependent on the tempo of the Sequencer.
+      throw new
+          UnsupportedOperationException("Can't compute PPQ based lengths yet");
+    }
+    else
+    {
+      // This is a fixed tick per frame computation
+      return (long) ((tickLength * 1000000) / (divisionType * resolution));
+    }
+  }
+
+  /**
+   * The length of this sequence in MIDI ticks.
+   *
+   * @return the length of this sequence in MIDI ticks
+   */
+  public long getTickLength()
+  {
+    long length = 0;
+    Iterator<Track> itr = tracks.iterator();
+    while (itr.hasNext())
+    {
+      Track track = itr.next();
+      long trackTicks = track.ticks();
+      if (trackTicks > length)
+        length = trackTicks;
+    }
+    return length;
+  }
+
+  /**
+   * Get an array of patches used in this sequence.
+   *
+   * @return an array of patches used in this sequence
+   */
+  public Patch[] getPatchList()
+  {
+    // FIXE: not quite sure how to do this yet.
+    throw new UnsupportedOperationException("Can't get patch list yet");
+  }
+}