Conversation so far:
What was special about Mal Waldron's artistry?
Before his breakdown, Mal Waldron played in a lyrical way, but after that he couldn't find that lyricism inside himself and became a very angular player.
What instrument did Mal Wauldron play?
Mal Waldron played the piano.
What was lyrical about Mal Waldron's playing?
When he first played with Charles Mingus, Mal Waldron was a follower of Horace Silver's style, adding chords and passing notes, as well as Bud Powell's, which contained many runs.
Are there any other interesting aspects about the Mal Waldron article?
A breakdown caused by a drug overdose in 1963 left Mal Waldron unable to play or remember any music; he regained his skills gradually, while redeveloping his speed of thought.

Question: who else did he work with?
Self-contained rewrite: Who else did Mal Waldron work with?