Nirvana's music has inspired a few generations of musicians now and it will continue to forever and ever. I'm not just talking about in the rock and alternative worlds, either. The bluegrass band Iron Horse has a covers album coming out on Record Store Day, April 22nd, where they did Nirvana songs. It's part of their Pickin' On series where they've covered The Beatles, Metallica and more. Here's their bluegrass version of "All Apologies" and it's damn good.