The first ever MySpace [ tickets ] Music Tour, co-headlined by alt-rockers Say Anything [ tickets ] and synth-pop outfit Hellogoodbye [ tickets ], kicked off last night (10/16) in Seattle and is scheduled to criss-cross the US into late November.

The trek, which continues tonight (10/17) in Portland, OR, also features electro-pop act Young Love and Japanese new-wave rock band Polysics. Since last check, dates have been added in Moon Township, PA, and Agoura Hills, CA. Details are listed below.

All four groups on the bill built a following through MySpace before finding success at radio, MTV or with a major label, according to the tour's MySpace page.

"It speaks to the power of Internet and how we discover music today," MySpace co-founder Tom Anderson said in a posting. "Things have really changed in the last four or five years; it's pretty easy to find great new bands, even if the guy at your local radio station is too lame to give them any spins."

Say Anything is supporting its sophomore set, "In Defense of the Genre," which is scheduled to drop next Tuesday (10/23). Four tracks from the two-disc album, including lead single "Baby Girl, I'm a Blur," are streaming at the band's MySpace page, which has logged more than 7 million profile views and upwards of 17 million plays, according to a press release.

Hellogoodbye continues to push its 2006 debut, "Zombies! Aliens! Vampires! Dinosaurs!," which includes songs from demos and previously released EPs. Singer Forrest Kline said the band can hardly believe how far it's come from playing the occasional live show in its hometown of Huntington Beach, CA.

"It's completely beyond anything we could comprehend," Kline told LiveDaily during a recent interview. "Two years ago, it was beyond anything we would have thought. We would just play shows at the local venue like once a month. That was the big time, beyond what was expected."

When the US tour wraps in Las Vegas Nov. 23, Say Anything and Hellogoodbye will cross the Pond for a run of UK shows.