Activision has bolstered the Xbox 360 Guitar Hero World Tour music library with songs by Nirvana and some European bands we've never heard of. But we're not very cool.
The Nirvana tracks are "You Know You're Right", "Silver" and "Negative Creep". And as usual, each can be picked up for 160 Microsoft Points (GBP 1.36 / EUR 1.92), or as a trio for 440 MSP (GBP 3.74 / EUR 5.28).
The European tracks, on the other hand, are "Mama Mae" by Negrita, "Dis Moi" by BBBrunes and "54 74 90 2010" by Sportfreunde Stiller. The same pricing rules apply.
Of those, the latter - a German rock band - seem to be the most well known. Still, we might be wrong, like that time we inappropriately groped a person who wasn't actually our friend at all.
The PlayStation Store hasn't been updated yet, so we're unsure if these songs will also appear there.