1. 2010-07-30 Re: collisions with optional voice ... lilypond- Neil Puttock 2. 2010-07-30 Re: collisions with optional voice ... lilypond- James Bailey 3. 2010-07-30 Re: collisions with optional voice ... lilypond- Phil Holmes 4. 2010-07-29 collisions with optional voice ... lilypond- apqc