The 28-year-old victim was riding the F train around 7:20 p.m. on May 7 when he and the three "dance show" train entertainers got into a verbal dispute.
As the train came to a stop in Astoria, officers say the suspects hit the man several times before fleeing the scene.
The victim was taken to Cornell Hospital for treatment.
The suspects are described as being black men between 17 and 19 years old.
Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS (8477).