Rollin' down the rock 'n' roll river hasn't always been smooth for John Fogerty.But he keeps on chooglin' nevertheless.A Rock and Roll Hall of Famer as the leader of Creedence Clearwater Revival and a solo artist since 1972, Fogerty is considered one of American rock's top songwriters, with some tunes -- such as "Proud Mary," "Bad Moon Rising" and "Centerfield" -- that have reach rarified, iconic status.