Harmonix and MTV Games announced today the addition of seven new tracks to the Rock Band Music Store catalog of downloadable content including a 3-pack from Irishhard rock band Thin Lizzy as well as songs from Nikko, Pat Benatar and The Pretenders.

The Thin Lizzy 3-pack features live recordings of "Boys are Back in Town," "Jailbreak" and "Cowboy Song." The 3-pack will become the first Thin Lizzy tracks to join the Rock Band music library, and are taken from Still Dangerous: Live At The Tower Theater Philadelphia 1977. This newly discovered live album, featuring the quintessential Lizzy lineup-Phil Lynott, lead vocals/bass; Scott Gorham, guitar; Brian Robertson, guitar; Brian Downey, drums-showcases the band at the height of its prodigious powers and will be released on Vh1 Classic Records on March 3, 2009.

Rock sensation Pat Benatar has her Rock Band debut with the popular single "Hit Me With Your Best Shot." This week's lineup also includes "Precious" from British rock band The Pretenders, as well as "Break My Heart" and "Don't Tell Me" from Nikko as featured in the movie Spectacular! The Pretenters' songs "Brass in Pocket" and "Blue Christmas" were added as downloadable content last year.