"He also used a Fender Bassman on about four songs and a Vox AC30 for some clean tracks. Four microphones were used to mic Kurt's speaker cabinet (he would pick which mic he liked best for each song and its signal was sent through the Neve console at Sound City): a Shure SM57, an AKG 414, a Neumann U87, and occasionally a Sennheiser 421."

Used for the toms on Nevermind, as stated by producer Butch Vig in this March 1997 Sound on Sound interview.

"In the case of Dave Grohl's kit I used an AKG D12 and a FET 47 on the kick, and then we built a drum tunnel consisting of old drum shells attached to the bass drum and extended out about six feet. That way you can move a mic back three to four feet, and the FET 47 was a little farther away from where the front head would have been. By having the drum tunnel, you isolate the room, so that you don't get all of the cymbal bleed, or whatever."

Otherwise the drum miking was fairly standard: a Shure SM57 on the snare, along with an AKG 451, Sennheiser 421s on the toms, AKG 414s and Neumann KM84s on the cymbals, and Neumann U87s for distant room mics.

In this photo, Kevin can be seen with a Sennheiser MD 421.

Used on Lullabies to Paralyze for guitars. Sound engineer Joe Baressi : "The two microphones I use most for recording electric guitars are the Shure SM57 and the Sennheiser MD421, often both, close up, placed at the edge of the speaker, where the speaker centre meets the cone, or, if I'm looking for a more bright sound, dead centre."

"There’s also a Sennheiser 421 in the back of each cabinet to give more energy for FOH," mentions Will Doyle, a sound engineer that knows about Alex Turner's equipment setup, in reference to the Sennheiser MD 421 Microphone.

Sennheiser MD 421 mics were used to record toms for Daft Punk's Random Access Memories album.

"n 1971 George Harrison and Ravi Shankar held their famous Concert for Bangladesh at New York’s Madison Square Garden. The stage was positively bristling with MD421s, including all of the stars’ lead vocal mics (Eric Clapton, Ringo Star, George Harrison, Bob Dylan, Leon Russell and Billy Preston) Check out the video." -Martin Mitchell's Microphones.

Mix engineer Tommaso Colliva on recording Drones : "During tracking we had an amp setup consisting of hand–wired Marshall 1959, Diezel VH4, and vintage 1960s JMI Vox amps, recorded with a standard Shure SM57 and Sennheiser MD421 pair, and just a mic pre and some desk EQ, keeping things quite simple."

Can be seen up close around 0:15, likely used by the other Beatles as well.

sennheiserusa posted this quote by the Black Keys' FoH engineer (Oct 2014 via Instagram):

“I went for a combo of e 906 and MD 421for Auerbach’s main guitar rig, with the 906 placed near the centre of the cone to get all the mid/hi-mid details plus the crunch and fuzz that comes from the Marshall amp and Fender guitar, and the 421 placed midway or nearer to the outer edge of the cone to get the low-mid warmth" - Jason M. Tarulli, FoH Engineer for The Black Keys #Sennheiser #MD421 #e906

"In 1971 George Harrison and Ravi Shankar held their famous Concert for Bangladesh at New York’s Madison Square Garden. The stage was positively bristling with MD421s, including all of the stars’ lead vocal mics (Eric Clapton, Ringo Star, George Harrison, Bob Dylan, Leon Russell and Billy Preston) Check out the video." -Martin Mitchell's Microphones.

"I use usually three microphones, on one cabinet and the way that they're placed is all properly in phase. And I'll use a 57, you know, [Sennheiser] 421 and maybe a Beyer 160. And they all have extremely different characters. And if you can properly blend these characteristics.."