Parentheses : optional anacrouse and chords at the end of a score

[Guy Melançon]

I understand the \parenthesize command applies to a single note.

I would like the parentheses to wrap more tan just one note. Something like \parenthesize {c4 d e f} to have a parentheses right before c and after f. This would be useful writing a jazz score to include an optional anacrouse in the last measure.

I would also be interested in doing the same thing with the chords written above the staff.

Any ideas, anyone?

Thanks