Kurt Cobain's guitar strings: the Nirvana rig, sourced

Kurt Cobain was the founding guitarist, lead vocalist, and primary songwriter of Nirvana, the band he started in Aberdeen, Washington in 1987 with bassist Krist Novoselic. Drummer Dave Grohl joined in 1990, completing the lineup that recorded Nevermind (1991) and In Utero (1993). Nirvana's commercial breakthrough is widely credited with pushing grunge and alternative rock into the mainstream, and Cobain became, whether he wanted the job or not, the reluctant face of that shift. He died in April 1994 at age 27.

He wrote quiet-loud-quiet songs built on simple, powerful chord shapes, and he played them on some of the cheapest guitars Fender ever made. That combination, unglamorous gear pushed through a short pedal chain, is a big part of why Nirvana's records still sound raw instead of polished.

Dean Markley 2504 Light Top/Heavy Bottom strings (.010–.052) on Fender Mustangs and Jaguars, mostly in standard tuning, through a short pedal chain built around a Boss DS-1 distortion and an Electro-Harmonix Small Clone chorus.

The exact 2504 and its lighter 2502 sibling are both long discontinued. Dean Markley's current Blue Steel Light Top/Heavy Bottom (.010–.052, SKU 2558) is the closest same-brand replacement: Buy on Amazon.

Cobain's most-documented set is Dean Markley's 2504, a Light Top/Heavy Bottom design gauged .010, .013, .017, .030, .042, .052. A receipt from Music 6000, a shop in Lacey, Washington, dated July 18, 1990, shows him buying that exact set. His guitar tech at the time, Earnie Bailey, wrote in a 1996 equipment rundown that Cobain "used .010-.052 Dean Markley's (the red pack)," matching the packaging shown on that receipt. A second, undated receipt from the same shop shows Cobain also buying Dean Markley's lighter 2502 set (.009–.042) at some point, though there is no other evidence it was ever his main gauge.

The stranger claim comes from a January 1992 Musician magazine interview, where Cobain said this about his strings:

I use piano wire for guitar strings, 'cause it's a lot thicker. I buy it in bulk, in these big long tubes, and just cut it to the length of the guitar. They're thicker than the thickest guitar gauge that's available. I don't know what the thickness of 'em is anymore, I can't remember. I use a really thick E string, and then a smaller size A. A few of the others are guitar strings, I think I use Dean Markley because they're the cheapest.

Guitar historians, including the archive site Ground Guitar, treat this as an exaggeration that calcified into legend: piano wire does not fit standard tuning machines or nuts, and a heavier-than-average Dean Markley set achieves nearly the same low-string thump without the hassle. The receipt evidence backs the simpler explanation.

Both the 2504 and 2502 have been out of production for years. If you want the same light-top/heavy-bottom concept today, Dean Markley's Blue Steel line still makes an LTHB 10–52 set (SKU 2558), cryogenically treated rather than plain nickel, but the same gauge layout.

Cobain was not chasing boutique tone. Mustangs and Jaguars were the cheapest guitars in Fender's lineup through the 1960s and 70s, short-scale and comparatively unstable at the bridge, and considered student-grade instruments by working guitarists of his generation. He liked them anyway. "Out of all the guitars in the whole world, the Fender Mustang is my favorite," he told Guitar World in 1992, in the same interview where he complained about how hard Mustangs are to keep in tune.

The heavy-bottom Dean Markley gauge did real work here. A .052 low E under standard tuning carries more low-end thump than the .046 most rock players ran at the time, which matters on a guitar with a shorter 24-inch scale where lighter gauges can already feel loose. The .010 high E stayed light enough for the bends and single-note runs scattered through songs like "Come As You Are," so the set solved two problems, thin scale-length low end and playable high strings, with one gauge choice.

The rest of the sound came from restraint, not sophistication: one or two pedals at a time, a handful of amps swapped session to session, and a Small Clone chorus that producer Butch Vig has said he is still not sure how much made it to tape versus how much got added at mixdown. Nirvana's engineering was simple by design. The strings were one of the few constants underneath it.

Three things across Nirvana's catalog you can identify as Cobain's:

1. Loud-quiet-loud dynamics. Verses that barely move, choruses that detonate. The contrast that drives "Smells Like Teen Spirit" and the album sequencing on Nevermind became the most widely copied songwriting trick of the decade that followed.

2. Self-described non-technician. Cobain called himself "the anti-guitar hero" when Fender asked to put his name on the Jag-Stang, adding that he could barely play the things himself. His solos are short, melodic fragments rather than displays, closer to a second vocal line than a guitar showcase.

3. Guitars as disposable props. He bought a run of cheap Stratocasters and Japanese Strat-style copies specifically to destroy on stage, most famously the black Strat smashed at the end of "Endless, Nameless." That was a deliberate, budget-conscious extension of the band's anti-spectacle stance: wreck a guitar that cost a couple hundred dollars, not a vintage one.

The core electric stable, sourced from Guitar.com's Nevermind gear feature, Mixdown's rundown, Fender's own Jag-Stang history, and Ground Guitar's archive.

The historical set, and the closest thing you can buy today.