It's A Long Walk To D.C.

...but I've got my walkin' shoes on.

The Staple Singers - Long Walk To D.C. (mp3)

Also, from the same collection, The Soul Children tell you what to do when in doubt:

The Soul Children - Give 'em Love (mp3)

Both tracks from The Complete Stax-Volt Soul Singles, Vol. 2: 1968-1971.