For a some singing inspiration (singspiration!), here is a beautiful Madrigal by Thomas Weelkes (1574-1638)
And for great contrast, here is a song by Sara Bareilles from the Musical Waitress
And for further contrast, here is a beautiful album of a cappella songs from around the world sung by Northern Harmony.
https://northernharmony.bandcamp.com/album/no-coward-soul-2010
Isn’t it amazing what the human voice can do, express and create?
Happy listening!
we have fallen into the place where everything is music - rumi 