Gotta give this one up to my old pal Jimmy Mitchell. Jimmy turned me onto to the 24/7 Acapella channel on iTunes. Now, I may be the last person on the planet to know the channel existed but it is wonderful! To find it on iTunes, go to Radio, then Religious, then Acapella (1.FM TM).
It is not only uplifting and encouraging, but a memorable blast of Tulsa Workshops, of Harding Uplifts, even Pleasant Home singings.
Give it a listen and if able, put it on in the background while you work. It is inspiring and refreshing.