The band, whose biggest hit was last years Number 35 smash "Revolution (In The Summertime)" have issued a statement saying guitarist Stephen Fleming will take over vocal duties.
"Daniel Wylie, singer of the group Cosmic Rough Riders, has left the band on an amicable basis to pursue a solo career."
"The remaining band members are to continue as Cosmic Rough Riders, with Stephen Fleming adding lead vocals to his guitar duties."
Both Cosmic Rough Riders and Daniel Wylie plan to issue new material this year.