The term 'drum organ' is a type of musical instrument that combines the sound of a drum with the sound of an organ. It is also known as a 'drum machine' or 'drum synthesizer'. The crossword solution for this term is EAR, which stands for Electronic Acoustic Research. This was a company founded in the 1970s by Don Buchla and Roger Linn, two pioneers in the field of electronic music. They developed the first commercially available drum machine, the Drum Organ, which was released in 1978.