Shopping! The Musical. The world is made up of two kinds of people — those who like musical revues and those who really, really don't. Writer and director Morris Bobrow's original compilation of song and skits is unlikely to convert anyone, but its 80 minutes are filled with plenty of amusing harmonized insights into everyone's favorite pastime. Who hasn't gritted their teeth at the quasi-ethnic knickknacks at street fairs? And, yeah, what exactly are handling fees? The evening could do with more variety of musical and performance styles; it falls back too often on the softly building show tune and the big-eyed, winking delivery. But as they enter the third year of their run in March, Bobrow and his cast and crew have honed an enjoyable formula that keeps you smiling — if not always singing — along. Ongoing at the Shelton Theater, 533 Sutter (at Powell), S.F. Tickets are $27-$29; call 392-8860 or visit www. shoppingthemusical.com. (Molly Rhodes) Reviewed Jan. 2.