So sad!
What a stellar artist. Not only a free spirit and expressive Reedist but also really important for the advance of European jazz.
Simion incorporated the folk of his homeland Romania, especially Transylvania, into his music - up to the instruments: Listen to the cymbalon on his album "Third Rhapsody".
And he founded his own label, "7 Dreams Records". Many excellent recordings, of course as Pim said, above all with Mal Waldron (my favourite: "Misterioso - Live in Zürich") but also several excellent ones under his own name.
RIP