10/08/1990 at 01:00 AM EDT
>Here's a tuneful duet. On Friday (Oct. 5, 9 P.M. ET), PBS has Spike & Co.: Do It a Cappella. Spike Lee and Debbie Allen host a lively conclave of unaccompanied singing groups, among them Take 6, the Persuasions and Ladysmith Black Mambazo. Instruments will be on hand for CBS's live broadcast of The Country Music Association Awards on Monday (Oct. 8, 9 P.M.). Nashville's new kid on the block, Garth Brooks, dominates the proceedings with five nominations.