Many of the guitars are "quirky and irreplaceable with sentimental value," according to the studio's co-owner.

Many of the guitars are "quirky and irreplaceable with sentimental value," according to the studio's co-owner.

Unlike Petty — who famously took guitar lessons from Don Felder when he was young and referred to rhythm playing as "a lost art" — Campbell is self taught.

The Raisins co-founder has returned to making his own music after years of commercial work. He looks back on his fruitful ...