The way I'd do it is to force the length of the held note to match that of the sung cadenza by multiplication. For instance if there is a semibreve c being held while the cadenza part adds up to 7 crotchets, I'd write it as c1*7/4. But you could just write it normally and pad it out with skips (s2. in this instance) I guess.
Paul From: John Burt <b...@brandeis.edu> To: lilypond-user <lilypond-user@gnu.org> Sent: 26/12/2023 20:21 Subject: Hold a note the length of a cadenza Dear list,While one part is singing a cadenza another part is holding a long note. I know how to make a rest or a skip the length of a cadenza bu not how to make a held note the length of the cadenza. thanks John Burt