does this team have a theme song?
Yes, Here Come the Yankees.
New York Yankees
The official fight song for the Yankees is "Here Come the Yankees", written in 1967 by Bob Bundin and Lou Stallman. 
who is bob meusel? American baseball left and right fielder. when did he start playing? 1917 for which team did he play? Vernon Tigers what was his relation with ny yankees? NY Yankees purchased his contract.
wiki:8788147
New York Yankees [SEP] Fight and theme songs
The official fight song for the Yankees is "Here Come the Yankees", written in 1967 by Bob Bundin and Lou Stallman. While it is not used as often, it is still heard frequently in instrumental form, most prominently in radio broadcasts, until 1990 it was played as the theme for television broadcasts in several versions. Another song strongly linked to the team is "New York, New York", which is played in the stadium after home games. The Frank Sinatra cover version is traditionally played after victories, and the Liza Minnelli original version after losses. However, due to a complaint from Minnelli, regardless of the result of the game played in the stadium it is the Sinatra version that is played to close it out.