SIGNINGS, ETC. -- MySpace Records picks up L.A. trio Nico Vega and Tokyo noise-popsters Polysics. The label will also (finally) release the debut from Hollywood Undead on Sept. 18. Switchfoot has left Columbia Records...Word is that the derby to sign 19 year-old Queens (via Puerto Rico) singer Carmireli is all but done -- more news as we get it... This could be old news, but it's news to us: "Heroes" actress Hayden Panettiere signed a record deal with Hollywood Records... Thrice, dropped from Island Records, gets picked up by Vagrant...