The chordmap track list contains data for a Track Form. It is organized as follows:
<pftr-list> -> LIST('pftr'
    <pfrf-list>...
    )
 The data consists of one or more lists containing timestamps and references to chordmaps:
<pfrf-list> -> LIST('pfrf'
    <stmp-ck>
    <DMRF-list>
    )
 The notation for the timestamp chunk is as follows:
<stmp-ck> -> stmp( <DWORD> )
 For information on <DMRF-list>, see Common Chunks.