A new digital album explores little-known soul trio The Salty Peppers, best known as the elements of one of the best soul bands of the 1970s: Earth, Wind & Fire. In 1969, Maurice White, the drummer in the Ramsey Lewis Trio, struck out on his own on the Chicago music scene first as a songwriter and then as the drummer in a new quartet of his own creation. With two friends, keyboardist/bassist Don Whitehead and singer Wade Flemons and Don Whitehead, White would found a trio, The Salty Peppers. Their type of…