Wakin Chau 周华健 was a Math Major at University

Something interesting that not many people know?

Also see Famous Nonmathematicians who studied Mathematics.

Wakin Chau was born in a rice store owned by his family in Sai Ying Pun, Hong Kong. Growing up as the fourth son in his seven-member family, Wakin learned to play the guitar when he was about 13 years old. In 1979, he left for Taipei to major in mathematics at National Taiwan University. During his college years, he sang and played folk songs in local coffee shops. This activity was a tradition among NTU students, and it is how Wakin learned to sing in Mandarin, which would be key to his future as a music-maker in Taiwan.

Source: Wikipedia

Probably one of his most famous songs is “Friends”, 朋友.