http://www.rollingstone.com/rockdaily/index.php/2009/08/27/kurt-cobain-joins-guitar-hero-5-how-nirvana-came-to-the-game/:

Indeed, securing the proper approvals was no small feat. Not only did Cobain’s widow Courtney Love have to sign off on behalf of the estate, so did former drummer Dave Grohl and Primary Wave Publishing, which administers the Nirvana catalog. “There’s a lot of moving parts to something like this,” Riley explains. “But it was about timing, not an issue of resistance. We almost did it for World Tour, but we couldn’t get it together. Then after three years of working with the different parties, it was like the perfect storm.”

Naturally, Love did have some concerns. Namely, Cobain’s physique, Riley reveals. “Courtney supplied us with photos and videos and knew exactly what she wanted Kurt to look like,” he says. “She picked the wardrobe and hair style, which turned out to be the ‘Teen Spirit’ look, then we went back and forth over changes — some subtle, some not so subtle.” In column B? Love’s reference to the Greek God Adonis, whose youthful good looks made the male deity an object of desire. “She certainly had a physical image in mind,” says Riley. “She wanted him to have that sort of athletic definition but not overly so.” And while Love has long had a reputation for being difficult, Riley’s experience was anything but. “She was actually great to work with,” he says. “She got back with comments pretty quickly.”