nine months of existence, many of which remained unreleased for decades, including an interpretation of Henry Glover's "Drown in My Own Tears". 1970–1971: Focus on American success During 1970, with the Immediate label having finally collapsed, Humble Pie signed to A&M Records and Dee Anthony became their manager. Anthony was focused on the US market and suggested the band discard the acoustic set and instigate a more raucous sound with Marriott as the front man. The group's first album for A&M, Humble Pie, was released later that year and alternated between progressive rock and hard rock. A single, "Big Black Dog", was released to coincide with the album and failed to chart, however the band was becoming known for popular live rock shows in the US. It was during this period that Peter Frampton acquired his famed "Phenix" guitar, the black 1954 Les Paul Custom that became his signature instrument and his favourite guitar for the next decade. Humble Pie was playing a run of shows at the Fillmore West in San Francisco in early December 1970 and during the first show Frampton was plagued by sound problems with his then-current guitar, a semi-acoustic Gibson 335, which was prone to unwanted feedback at higher volumes. After the show he was approached by fan and musician Mark Mariana, who loaned him the modified 1954 Gibson Les Paul, and by the end of the second show Frampton had become so enamoured of the guitar that he offered to buy it on the spot, but Mariana refused payment. Frampton played it almost exclusively for the next ten years. It was featured on the cover of Frampton Comes Alive and was thought to have been destroyed in 1980 when a plane carrying Frampton's stage equipment crashed in Venezuela during a South American tour, killing the crew, but with the guitar in fact surviving the accident with some minor damage. It was eventually returned to Frampton in 2011. On 9 July 1971 Humble Pie opened for Grand Funk Railroad at their historic Shea Stadium concert, an event that broke the Beatles record for fastest selling stadium concert, to that date. Also in 1971, Humble Pie released their most successful record to date, Rock On, as well as a live album recorded at the Fillmore East in New York entitled Performance Rockin' the Fillmore. The live album reached No. 21 on the US Billboard 200 and