To improve human legibility and understanding it is allowed to include comments. Two consecutive slash characters (//) will be interpreted as the start of a comment and all text until the end of the line will be ignored. For example:
// This is a score with comments
(score
(vers 1.5) // version 1.5 of LDP is used
(instrument // Start of music for the first voice
(musicData // start this voice
(clef G) // Clef: G on 2nd line
(key C) // Key signature: C major
(time 4 4) // Time signature: 4 4
(n c4 w) // Note. Pitch: C4, duration: w (whole note)
(barline) // a simple barline
)
)
)