The tremoloa , plural tremoloas , is a stringed instrument belonging to the Chord group family of the fretless zither family , produced in America in response to the rapid increase in popularity of Hawaiian music during the 1920s , and continued to be produced until the 1950s .
The tremoloa , plural tremoloas , is a stringed instrument belonging to the Chord group family of the fretless zither family . 
 It was produced in America in response to the rapid increase in popularity of Hawaiian music during the 1920s , and continued to be produced until the 1950s .