After Howard left college, he joined a short-lived rock band called Mama Lion. The band was led by Neil Merryweather (bass, backing vocals) and featured lead singer Lynn Carey, Coffi Hall on drums, and Rick Gaxiola on guitar. Mama Lion recorded two full-length albums. Members of Mama Lion also formed the band Heavy Cruiser with Merryweather now on lead vocals, recording two albums whose genre was closer to hard rock, bit also displayed psychedelic and progressive influences. He then worked for a couple of years as a session musician with artists including Diana Ross, Ringo Starr, and Harry Nilsson. In the early 70s, he described himself as being "dirt poor", until his big break in 1975 when his manager got him an audition with Elton John. He joined John's band and toured with them as keyboardist during the late 70s and early 80s. He was part of the band that played Central Park, New York, on September 13, 1980. Howard also arranged strings for several of John's songs during this period including the hits "Don't Go Breaking My Heart" and "Sorry Seems to Be the Hardest Word", and played additional keyboards and synthesizers on studio albums including "Rock of the Westies" (1975), "Blue Moves" (1976), "21 at 33" (1980), and "The Fox" (1981).