Los Angeles-based trumpeter and composer Josef Leimberg had a lengthy résumé before he became known to a broader audience through his work on Kendrick Lamar's platinum-certified, Grammy-winning To Pimp a Butterfly. He arrived during the early '90s as a member of the short-lived rap group Mad Kap, King Tee associates who were among the early acts on Loud Records. After one album with that group, Leimberg shifted into session gigs. During the remainder of the '90s and the early 2000s, the artists who featured his work included Volume 10, Busdriver, Freestyle Fellowship, and Snoo...