From the Top: Not only did Craig...

From the Top: Not only did Craig Rosen, above, write a book about the last 40 years of Billboard’s album chart, but he listened to every record that has hit No. 1 since 1956. . . . As the North Hills author traipsed through used-record shops, he found records he’d grown up listening to. “It was a lot of fun to go back,” he said (F1B).

To the Bottom: Dive Devil is unlike any ride that Six Flags Magic Mountain near Valencia has ever offered (F1A). No sleek cars, no twisting tracks. Instead, riders are hooked to steel cables and hoisted 153 feet into the air, then let loose to swing back and forth at speeds of up to 60 mph. . . . One rider called it “the most stupid thing I have ever done.”

Horsing Around: Talk about your dog-and-pony show. City Councilman Joel Wachs will visit the corner of Foothill Boulevard and Orcas Avenue in Lake View Terrace at 10 a.m. today to dedicate a new traffic signal equipped with equestrian signal buttons. . . . Wachs may even ride a horse.

Small Scale: A nonprofit group of Valley businessmen and arts patrons has once again downsized its proposal for a costly arts complex in the Sepulveda Basin (B1). . . . If the Cultural Foundation gets its way, the envisioned Arts Park L.A. would feature three performance and exhibit facilities on 42 acres along the federal flood plain’s northern border.