Michael Shrieve is an American drummer, percussionist, and composer. He is best known as the drummer of the rock band Santana, playing on the band's first seven albums from 1969 to 1974. At age 20, Shrieve was the second youngest musician to perform at Woodstock. His drum solo during "Soul Sacrifice" in the Woodstock film has been described as "electrifying", although he considers his solo during the same piece in 1970 at Tanglewood the superior performance.

Sam Roy Hagar, also known as the Red Rocker, is an American singer, songwriter, and guitarist. He rose to prominence in the early 1970s with the hard rock band Montrose before launching a successful solo career, scoring a hit in 1984 with "I Can't Drive 55". He enjoyed further commercial success when he replaced David Lee Roth as the lead vocalist of Van Halen in 1985, but left in 1996. He returned to the band from 2003 to 2005. In 2007, Hagar was inducted into the Rock and Roll Hall of Fame as a member of Van Halen. His musical style primarily consists of hard rock and heavy metal.