The band unanimously decided to carry on, and enlisted Lamar Williams on bass and Chuck Leavell on piano. The band began recording "Brothers and Sisters", their follow-up album, and Betts became the group's "de facto" leader during the recording process. Meanwhile, after some internal disagreements, Allman began recording a solo album, which he titled "Laid Back". The sessions for both albums often overlapped and its creation caused tension within the rest of the band. Both albums were released in late 1973, with "Brothers and Sisters" cementing the Allman Brothers' place among the biggest rock bands of the 1970s. "Everything that we'd done before—the touring, the recording—culminated in that one album", Allman recalled. "Ramblin' Man", Betts' country-infused number, rose to number two on the "Billboard" Hot 100 and gave the band their biggest hit. The group returned to touring, and played arenas and stadiums almost solely. Privately, the group was dealing with miscommunication and spiraling drug problems. In 1974, the band was regularly making $100,000 per show, and was renting the Starship, a customized Boeing 720B used by Led Zeppelin and the Rolling Stones. "When got that goddamn plane, it was the beginning of the end", said Allman.