2006-era setlist questions

hello!

I have been re-organizing some old concert recordings I have, and this forum has been a VERY useful, thank you.

I have a couple of questions around 2006-era set lists that I am wondering if anyone here might be able to help answer.

shows with the memphis rhythm band started with a piece called "Soul Serenade". I'm trying to identify - is this a cover, if so, of what? or is it an original piece by the memphis rhythm band, if so are there any other recordings of it?

second question relates to "Since You Been Gone", another piece performed by the memphis rhythm band. it is always identified on this site (as well as on setlist.fm) as a "Maceo Parker cover". anyone know where this credit originated? I ask because I am having trouble tracking down a recording of this song by Maceo Parker. meanwhile I did find a suggestion that it is actually a cover of a song by Garland Green (someone Tennie Hodges worked with). links:
https://transpondster.tumblr.com/post/35387679201/touring-with-cat-power-at-the-time-and-with-a-bad
https://www.youtube.com/watch?v=XGF713G75j0