de quel instrument joues-tu
Je joue un instrument. You can use Google Translator, but i guarantee it'll either be too formal or completely wrong; ask your French teacher.
'un instrument' (masc.)
I would say "il ne joue d'aucun instrument" or "il ne joue pas d'instrument"
Impossible to say without knowing which instrument.
the most popular brass instrument is the french horn. I also play it :)
Yes, a french horn
Je ne joue pas tous les instruments.
Woodwind especially the double reed instruments are more difficult with the exception of the French Horn a brass instrument which is probably the most difficult wind instrument of all to play properly.
French horn Inderjeet Singh
The phrase "you play for" is "vous jouez pour" in french.
palmer (measure instrument) : un palmer (masc.)