Final answer:
The composer who has won the most Tony Awards is Stephen Sondheim.
Step-by-step explanation:
According to the information provided, the composer who has won the most Tony Awards is Stephen Sondheim.
Sondheim has won several Tony Awards throughout his career, including wins for his musicals Company and Into The Woods. His talent and contributions to the theater have been recognized and celebrated through these awards.
It is worth noting that other composers like Andrew Lloyd Webber, Richard Rodgers, and Lin-Manuel Miranda have also won Tony Awards, but Stephen Sondheim holds the record for the most wins.