One of the most common—and heinous—mistakes most bands make is not having a clavinet in their music. To state the bloody obvious, the clavinet creates one of the coolest sounds in the history of instruments. It's a keyboard with a husky, staccato twang in its DNA and it's played key roles in some of the funkiest tracks ever by Billy Preston, Sly & the Family Stone, Edgar Winter Group, the Commodores, Steve Miller Band, Parliament-Funkadelic, George Duke, etc.
Yes, clavinets are rather scarce in the wild, but, damn it, groups need to try harder to obtain 'em—unless they want to continue to handicap themselves with a clavinet-free sound. Use your connections, be resourceful, build one yourselves—do whatever it takes, people. Your music is too important for it not to have clavinet in it.