It's that time of year when rookies are made to play dress-up. In the past, the Yankees' first year players have done Star Wars, The Wizard of Oz, and Batman. This season's theme involved a hodgepodge of "musicians".
ESPN New York has the lineup from left to right:
Preston Claiborne (as Billy Ray Cyrus), Cesar Cabral (as Rick James), interpreter Jiwon Bang (as Psy), Brett Marshall (as Yoo Jae-Seok, one of the dancers in Psy's "Gangnam Style" video), David Adams (as Vanilla Ice) and J.R. Murphy (as Justin Bieber).
Those musicians were presumably chosen for being, like all Yankees rookies, mediocre and hugely famous.
[ESPN New York