OK Go is a rock band originally from Chicago, now residing in Los Angeles. The band is currently composed of Damian Kulash (lead vocals and guitar), Tim Nordwind (bass guitar and backing vocals), Dan Konopka (drums and percussion) and Andy Ross (keyboards, guitar and backing vocals), who joined them in 2005 in replacement of Andy Duncan.

The original members formed as OK Go in 1998 and released two studio albums before Duncan's departure. The band is notable for their unusual dress sense and their energetic music videos -- in particular, those for their two most successful singles, "A Million Ways" and "Here It Goes Again". The latter won a Grammy Award for "Best Short-Form Music Video" in 2007.

Sum 41 is a Canadian rock band from Ajax, Ontario. The current members are Deryck Whibley (lead vocals, guitar, keyboards), Cone McCaslin (bass guitar, backing vocals), and Steve Jocz (drums, percussion, backing vocals). The band's "classic" line-up is the same except with Dave Baksh on lead guitar and backing vocals.

Since signing an international record deal with Island Records in 1999, the band has released five studio albums, one live album (under two different titles), two live DVDs, more than fifteen singles, and sold over 10 million albums worldwide. It is reported that the band performed more than 300 times in a single year which is why they have become famous for their long and global tours, often lasting for more than a year.

Check both of them out live at the Coke Zero Stage at the IMS on Saturday, May 17th during qualifications for this year's Indy 500.