Final answer:
The provided references do not mention Coleman's quartet or a trumpet player, making it impossible to answer the question based on the given information.
Step-by-step explanation:
The question 'Who plays trumpet in Coleman's quartet?' suggests a discussion about a specific musical group or context not detailed in the provided references.
The given references from an unspecified source discuss "Three Friends" and "Street Musicians", which depict certain musical elements and musicians but do not mention a Coleman or his quartet featuring a trumpet player.
Thus, based on the context provided, we are unable to identify who plays the trumpet in Coleman's quartet. The reference materials discuss art pieces featuring musicians, but they do not provide information about Coleman's quartet or a trumpet player.
When additional context or the specific work in question is known, more accurate details can be provided about the musicians involved.