Greg Wells, Bob Clearmountain, Madlib and Mark “Spike” Stent are among the producers impacted by the devastation in Pacific Palisades and Altadena, along with scores of session and touring players.

Rebuilding homes destroyed by wildfires in the Los Angeles area could take more than a year to even begin — and that’s if everything goes smoothly, according to Rick Caruso, a billionaire developer ...