He replaced Carl Wayne, who died earlier in the year. The band's original singer of over 35 years was Allan Clarke, who retired in 1999. As well as providing main vocals on the Hollies' classic hits on live shows, he is also known for his solo acoustic versions of "Here I Go Again", the Bruce Springsteen song "Sandy", and "I Can't Tell the Bottom From the Top". Howarth provides lead vocals on The Hollies' two most-recent studio albums, "Staying Power" (2006), and "Then, Now, Always" (2009/2010) and the live album "We Got The Tunes " 2013
Howarth was featured with live recorded versions of the Hollies' hits, "The Baby" and "I Would Fly", plus the studio version of the song, "Then, Now, Always" on the Top-30 album charting album, "Midas Touch", in 2010.
Peter Howarth co-wrote the West End musical, "Robin, Prince of Sherwood", with 10cc guitarist Rick Fenn, which was commissioned and produced by Bill Kenwright. Played Roy Orbison in the musical "Only The Lonely" at London's Piccadilly and Whitehall Theatre's. He also wrote with Fenn under the name, 'Circle of 4'.
Howarth began his music career as a guitarist and has worked with many artists, Including Cliff Richard and The Who, as a touring and session musician.