Final answer:
The Boston PBS TV station that debuted in 1951 with a classical radio concert is WGBH, known for its quality educational content.
Step-by-step explanation:
The call letters of the Boston PBS TV station that first broadcast a classical radio concert in 1951 are WGBH. This station is a significant part of public television history, which offered a nonprofit alternative to the major U.S. networks such as ABC, CBS, and NBC. WGBH, along with other public broadcasting entities like PBS, the BBC, and the CBC, has been recognized for its high-quality programming and global perspective, setting it apart from the more commercialized network stations.