Reprinted from yesterday's late editions.

Geoff Muldaur and Amos Garrett have this thing about the past: As far as they're concerned, the older the song, the more fun it is to perform. At The Childe Harold, where they will be appearing as a duo with Magpie through tonight, they're reaching back and dusting off tunes by composers as different as Hoagy Carmichael and Sleepy John Estes.

It makes for a very low-key show, especially when these two veterans of Better Days and other folk and blues units of past years pick up acoustic guitars and begin to swap jokes. That's what they did on "Lazy Bones," a song whose very lyrics and rhythm allow them to indulge to the maximum in relaxed picking and easy-going camaraderie.

On some of the blues tunes they have worked up, however, the approached is a bit more intense. Magic Sam's "I Fell So Good" and Estes "Leaving Trunk" are prime examples: Garrett gets a chance to play some fine electric guitar, and Muldaur slips easily into the role of the blues shouter.

Both men are excellent singers and instrumentalists. With styles that mesh neatly. Garrett, usually thought of only as a superb guitar technician on the basis of the studio work he's done with Bonnie Raitt, Paul Butterfield, Muldaur's ex-wife, Maria, and others even turns out to possess a pleasant baritone voice, which was displayed perhaps most effectively on "Carolina Sunshine Girl."