Rosegarden would make a worthy addition to Fedora Extras. It's music editing software, and should integrate nicely now that Fedora is using ALSA.
Some-one already seems to have had a go at this: https://www.redhat.com/archives/fedora-extras-list/2005-March/msg01009.html
Rosegarden4 is excellent. Up until know I have been using the ccrma version on an old x86 machine, but to have this in extras would be an excellent addition... especially if it is in x86_64.
Done (FC-4, FC-5 and devel).