Alpert set up a small recording studio in his garage and had been overdubbing a tune called "Twinkle Star", written by Sol Lake, who would eventually write many of the Brass's original tunes. During a visit to Tijuana, Mexico, Alpert happened to hear a mariachi band while attending a bullfight. Following the experience, Alpert recalled that he was inspired to find a way to express musically what he felt while watching the wild responses of the crowd, and hearing the brass musicians introducing each new event with rousing fanfare. Alpert adapted the trumpet style to the tune, mixed in crowd cheers and other noises for ambience, and renamed the song "The Lonely Bull".