Ooh, so glad you asked! Having musical training and talents like yours is a real blessing!
I've introduced my coven to many songs that we now use routinely in ritual. We cast the circle with song (usually the
Silver Rose Quarter Call, sometimes a musical adaptation of
Starhawk's Quarter Call).
SJ Tucker's rendition of the Witch's Rune is beautiful for building energy, although our usual favorite is the "Earth My Body" chant (it is really great for using energy). We usually close with
Kellianna's "Blessed Are We" song, and then the classic "May the Circle be Open" song. I've used some specific songs to invoke gods and goddesses, and one I like to use as a morning prayer. The
Witch's Reel is one of the most amazingly beautiful songs, in my humble opinion; it actually has a fascinating historical background as the first recorded spell in an actual 1600s witch trial (supposedly, it was used to conjure rain -- I've actually have had good experience with that one!). There's a lot out there if you look for "Pagan songs" on Youtube; I don't like all of them, but it's always fun to find one that you'd want to use in ritual!
I think music is one of the strongest anchors to Pagan practice for me. It sets the mood, delineates sacred space, and can help create group trance. Music can also be an offering to the gods and used in devotional practice. I've worked on developing my singing voice (which is still not great, but I can at least kind of carry a tune and sing on pitch!) for that reason. I'd love to get better at musical instruments as well at some point; I've started collecting some small, easy-to-play instruments (like rattles, drums, and bells) so that other people in my coven without musical training can participate as well.
There's a whole world of bardic magic out there that I have only just scratched the surface of. I once took a workshop on bardic magic and learned some super fascinating stuff: for instance, different keys and modes have magical associations that can be leveraged, and the elemental associations (e.g. air for wind instruments, earth for fire) with each instrument can also be a source of power. Sadly, music theory isn't my strongest suit so I won't be composing anytime soon, but there's a lot out there!