Final answer:
Without specific information on the song Matt heard near Safeco Field, it's likely that it could have been 'Take Me Out to the Ball Game' or a college fight song similar to 'The Victors.'
Step-by-step explanation:
The specific song Matt heard as they approached Safeco Field is not provided in the question or the reference information, making it impossible to answer confidently.
However, the reference mentions 'Take Me Out to the Ball Game', a classic song commonly associated with baseball games, composed by a Tin Pan Alley composer, which might be a song one would hear near a stadium like Safeco Field.
It also mentions college fight songs such as the University of Michigan's 'The Victors' and adaptations like 'Oh Wisconsin' that included specific school mascots and themes.