| Microsoft DirectX 9.0 SDK Update (October 2004) | 
The chord track list contains chord data for a Track Form. It is organized as follows:
<cord-list> -> LIST( 'cord'
  <crdh-ck>    // Header
  <crdb-ck>... // Chord body chunks
  )
<crdh-ck>
<crdh-ck> -> crdh ( <DWORD> )
The header is a DWORD containing the chord root in the upper 8 bits and the scale in the lower 24 bits. For an explanation of what these bits represent, see DMUS_IO_SUBCHORD.
The body of data for the chord track list consists of information about a chord change and the component subchords:
<crdb-ck> -> crdb(
  <DWORD>     // Size of DMUS_IO_CHORD
  <DMUS_IO_CHORD>
  <DWORD>     // Number of subchords
  <DWORD>     // Size of DMUS_IO_SUBCHORD
  <DMUS_IO_SUBCHORD>...
  )