Conversation so far:
who were the rock and roll trio?
In 1952, the Burnette brothers and their friend Paul Burlison formed a group called the Rhythm Rangers which was eventually renamed the Rock and Roll Trio.
when was the Rock and Roll trio formed?
In 1952, the Burnette brothers and their friend Paul Burlison formed a group called the Rhythm Rangers which was eventually renamed the Rock and Roll Trio.
what was the name of the group they formed?
In 1952, the Burnette brothers and their friend Paul Burlison formed a group called the Rhythm Rangers which was eventually renamed the Rock and Roll Trio.
did they release any albums?
Johnny Burnette and the Rock 'n Roll Trio is the 1956 debut album of the influential rockabilly band The Rock and Roll Trio.
what were the singles in the album?
Two singles from the album Johnny Burnette and the Rock 'n Roll Trio are Tear It Up and The Train Kept A-Rollin'.

Question: what did each of them do in the band?
Self-contained rewrite: what did each of the members of the Rock and Roll trio do in the band?