gtr­crd – Add chords to lyrics

The pack­age pro­vides the means to spec­ify gui­tar chords to be played with each part of the lyrics of a song. The syn­tax of the macros re­duces the chance of fail­ing to pro­vide a chord where one is needed, and the struc­ture of the macros en­sures that the chord spec­i­fi­ca­tion ap­pears im­me­di­ately above the start of the lyric.