Michael Stock's years hunched over boxes of records, trolling for vinyl treasure, certainly has paid off. Every Thursday afternoon Angelenos benefit from the staggering breadth of his musical archive. Stock is half of Part Time Punks (with Benjamin White), the duo who put on the eponymous Tuesday night series at the Echo, which means he's keyed into happenings on the local scene. He's been DJing for the past two years in clubs all over the city, including Spaceland, Silverlake Lounge, Tangier and the Vanguard, and has even taught a course at UCI on punk rock and the cinema. Can he be long-winded and verbose? Occasionally. Is he informative? You bet. There's much to be transmitted from Stock's encyclopedic brain, so give him a break. Tune in Thursdays and catch surf punk, scratchy R&B records, new pop, indie, experimental electronica, old Goth hits from the crypt, and international post-punk colliding on air. This professor, booker, promoter, DJ, human database of musical knowledge and radio personality has something to offer everybody. P.S. What did you do today, Jim Ladd? Thursdays, 2-6 p.m. on KXLU 88.9 FM.