Forget Freebird, move over DragonForce. Rock Band 4 just added the 17-minute classic In-A-Gadda-Da-Vida.

The '60s acid rock classic, originally released by Iron Butterfly, costs slightly more than normal due to its extraordinary length - nearly four times that of a standard Rock Band track.

Rock Band 4 song DLC still gets released every week, even two years after the game launched - and even after the game was forced to switch hardware manufacturers after the collapse of peripheral maker MadCatz.

New Rock Band DLC: Iron Butterfly Watch on YouTube

There's no doubting Rock Band 4's quality, however. "Building on its impressive back catalogue, Rock Band 4 is a rock-solid return for the stalwart music game," Eurogamer opined back in our 2015 Rock Band 4 review.

Earlier this year Rock Band 4 got Mass Effect and Archer DLC.