Their fourth album, "Monkey Business", was recorded through 2004 and was released on June 7, 2005. Much of the pre-production writing was performed on the John Lennon Educational Tour Bus while on the Black Eyed Peas tour of 2004. The album's first single, "Don't Phunk with My Heart", was a hit in the U.S., reaching number three on the U.S. Hot 100. The spot the song reached was the highest peak yet of their career in the U.S. (this was later broken when "Boom Boom Pow" peaked at the top spot of the "Billboard" Hot 100) and earned them another Grammy for Best Rap Performance by a Duo or Group. The song reached three in the UK, and five in Canada, and stayed at number one for three weeks in Australia. Some radio stations, concerned about complaints of obscenity, played an alternative version, "Don't Mess with My Heart". "Don't Lie", the second single from the album, saw success on the U.S. Hot 100, reaching No. 14, although becoming somewhat more successful in the UK and Australia, reaching a peak of No.6 in both countries. "My Humps", another song from the album, immediately achieved commercial success in the U.S. and fairly substantial radio play despite the sexually suggestive lyrics, reaching number three on the U.S. Hot 100 and number one in Australia, making it their fourth Australian number one single. However, many mocked the song for its poor lyrical content; John Bush, writing for AllMusic, described it as "one of the most embarrassing rap performances of the new millennium". Despite this, the album "Monkey Business" debuted at number two on the U.S. "Billboard" 200 albums chart, selling over 295,000 copies in its first week and was later certified triple platinum by the RIAA. Their next and last commercially released single from the album was "Pump It", which borrows much of its sound from "Misirlou", specifically Dick Dale's version; it peaked at number 8 in Australia but 18 in America.