| X | IndeX | The tune's index number within the file. If the index is zero, all the tunes in the file are returned. |
| M | Meter | The tune's time signature. If there are several, only the first is shown. |
| K | Key | The tune's key signature. If there are several, only the first is shown. |
| H | Headers | The ABC header lines that appear in the tune. X, T and K are omitted, as those lines are required. A double quote (") means that there are accompaniment chords. |
| T | Title | The tune's title. If there are several titles, each has its own entry, and they can be matched separately. |