Artist managers Bill Siddons and Howard Lapides have merged their companies to form Core Entertainment Organization in Sherman Oaks, Calif.

Artist managers Bill Siddons and Howard Lapides have merged their companies to form Core Entertainment Organization in Sherman Oaks, Calif.

Siddons is a onetime manager of the Doors and Crosby Stills & Nash, while Lapides has worked as a DJ, concert promoter and TV producer. The two will open with a roster that includes former Alice In Chains member Jerry Cantrell and several music clients signed outside the United States, as well as actors Tom Green and Mark Wahlberg.