The 2010 Primavera Sound Festival has made a big addition to its lineup, including names like Tortoise, Grizzly Bear, Built To Spill and Condo Fucks.

But also added are some interesting and long lost names: Seefeel, Beak>, Thee Oh Sees, Mujeres, Fake Blood, Major Lazer, Apse, Sian Alice Group, Ben Frost, Black Math Horseman and Monotonix. Tickets are on sale now.

Check out the Spacelab Festival Guide for more information on the Primavera Sound Festival line up, tickets, and other details.