Here's how the game works...
Person 1 name a Trek character, preferably a primary character but any will do.
Person 2 assigns that character a "theme song". The theme song may be any song already in existence, from Bach's symphonies to Bob Dylan to DMX. Person 2 provides a brief explanation as to why they chose that song, then names another character.
I'll go first. I name... Will Riker.