Strokes frontman Julian Casablancas is the latest artist to cash out on his song catalog. The singer has reportedly sold his stake in The Strokes’ catalog to Primary Wave – the company that owns song rights for artists like Stevie Nicks, Def Leppard, and Prince. Terms of the deal were not disclosed, but some recent publishing deals have involved hundreds of millions of dollars. Why are so many artists cashing out? Are we at the peak of the market, or will song rights keep going up?