I don't have anything new on offer yet, but here is a link to two of my stories that feature little Pippin singing.
All You Have to Do Is Ask (Features not only wee!Pip, but little Merry, Sam, Fatty, Folco and the Cotton brothers, and the first introduction of the infamous "100 Apple Pies" song!)
http://www.storiesofarda.com/chapterview.asp?sid=3043&cid=13318 “He Sat and Sang a Melody…” (One of my
20_rings fics, wee!Pip unwittingly serenading Merry, Sam and Frodo with one of Cousin Bilbo's compositions...)
http://www.storiesofarda.com/chapterview.asp?sid=3593&cid=14945 And I have a bunny brewing for something new...