Mouse on Mars are a musical phenomenon. After two decades of constant innovation and reinvention, they have lost none of their might and magic. And, just like jazz musicians, the duo seems to be getting ever more seasoned, savvy and uncompromising. The band's anniversary release - a compilation celebrating 21 years of band history with a bit more than 21 collaborations - seems like a logical move Mouse on Mars celebrate their "coming of age" surrounded by 30 of their peers. 21 again sees them dabbling in laid-back disco funk with Tim Gane (Stereolab / Cavern of Anti-Matter) or spinning jittery dream pop with Scratch Pet Land. Their collaboration with Candie Hank spawned a kind of desert polka, while Modeselektor and Puppetmastaz inspired anthemic hip-hop excursions. Tortoise and Laetitia Sadier take the duo into neo-post-rock territory, Eric D Clark supplies radio-friendly song-writing skills, Funkstörung - reunited for the occasion - deliver broken funk while the song with Junior Boys reinterprets R'n'B as a holographic genre. 21 again is an ode to joy and to the friends of the band, yet also an homage to constant dialogue and diversity.