Gerry Mulligan, at the Jazz Workshop through Sunday, is an exuberant baritone saxophonist who came up through the big-band establishment and is now ever-so-slightly progressive. He usually plays with a piano-bass-drums quartet, and he names his songs after esoteric novels sometimes. You should probably also be warned that Mulligan is a perennial member of the Playboy all-star jazz band.

Bobby Womack, besides having the world's best album covers, is a pretty good fast-paced soul singer and guitarist. He's not especially adventurous--most of his repertoire is tried-and-true middle of the road soft rock--but he does an exciting job with what he sings. Womack also has a terrific soul revue, including a huge band and three female backup singers, one of whom is sometimes Pam Grier, Rosie's sister. At the Sugar Shack all weekend.

Remember, this is your last big weekend before reading period, so it's important to live life to the hilt, right? Well, the real action this weekend is down in Yarmouth at the Cape Cod Coliseum, as follows:

The New Riders of the Purple Sage and Commander Cody and the Lost Planet Airmen start things off Friday in what is probably the best concert of the weekend. The New Riders, a Grateful Dead spinoff group named after a Zane Gray Western novel, play laid-back countrified rock with lots of pedal steel guitar.

Three Dog Night and Souther, Hillman and Furay play the big Saturday night Cape date. The Dogs are actually pretty bad although they've somehow earned a reputation for being great in concert; the Coliseum is intimate for them, since they usually play in football stadiums and the like. SH&F are part of the Byrds-Poco-L.A. set and very mellow.

The Incredible String Band, the Elvin Bishop Band and the Marshall Tucker Band finish up the weekend at the Cape Sunday night. The string Band is English and plays olde folke stuff, with lots of mandolins and other esoterica, and is generally soft and pleasant, sometimes extraordinarily lovely. Elvin Bishop was the lead guitarist in the Paul Butterfield Blues Band for years and years and is now on his own. He looks a little like Chico Marx and when he was with Butterfield he held his own playing blues in the same band as Michael Bloomfield, so he's no slouch.