The DMUS_IO_TRACK_HEADER structure contains information about a track. It is used in the Track Form.
typedef struct _DMUS_IO_TRACK_HEADER {
    GUID     guidClassID;
    DWORD    dwPosition;
    DWORD    dwGroup;
    FOURCC   ckid;
    FOURCC   fccType;
} DMUS_IO_TRACK_HEADER;
   Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dmusicf.h.
IDirectMusicSegment::GetTrackGroup, IDirectMusicSegment::InsertTrack, Track Form