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I'd be glad of help with my last two. They are 19a and 19d so they have the same first letter.

Band's victory songs ignoring the 10 (5)
??N?S
(If 10 is a cross-reference the answer there is 'issue'.)

Period in musical when tenor's substituted note (6)
??C?E?

Wicket, period in. Wicked/'Wicked' was the musical, swap D, note for T, tenor.

Wings - the band., Wi, victory +(son)GS, ignoring the son, issue.

Thank you malone. Those are the answers I got but I couldn't fit them to the clues.
Merry Christmas!

DavidW, glad I could help.