by William RuhlmannThe title makes a virtue of necessity, as John Mayall introduces another all-new lineup (actually, bassist Larry Taylor is returning from an older edition). Two guitarists, Hightide Harris and Randy Resnick, lead the band in more of an up-tempo R&B style than has been used in much of Mayall's music during the past several years, starting with the timely"Gasoline Blues" (1974 was the year of the gas lines, remember?) and going on to"Troubled Times" (which advises impeaching President Nixon). Still, this was a lackluster set, which is only appropriate since it was Mayall's swan song with Polydor, and the album became his first to miss the charts in the U.S. since 1967.