Sudha

I discovered this singer recently thanks to last.fm. The music is beautiful, and could be beneficial for meditation music.

Kellianna

Kellianna sings pagan music in a style similar to Christian Gospel music. Her music can be used for ceremonies, but I have not yet listened to her entire catalog, so I am unsure if her music is holiday specific or not. Either way, her music can be appreciated as religious music.

Spiral Dance

Spiral Dance is a band from Adelaide, South Australia. Their music is religious, Wiccan specifically. They have songs for each of the Sabbats, and sing many songs about mythology as well. This is one band I would recommended to anyone looking for Wiccan religious music.

Inkubus Sukkubus

This band has a unique sound, and is religious in nature. I admit I haven't listened to all of their music yet, so I'm not sure if any can be used as Sabbat music, but anything is possible.