I find it a little distracting that you only see half of the big horn players face. Also the arm to the very right of frame coulda been cropped out... Your skin tones look a little off also.
TC
Oh, it's so sad when I see a whole instrument... except for one tiny part of it that's been accidentally cropped off. A different focal length would have avoided the distortion you've got here from using wide angle. Otherwise the background lines would be straight. I feel it's accidental that the tuba player's face is obscured by his instrument. Composition doesn't seem thought out... placing the musicians using rule of thirds would have helped. If you have writing in the background, make sure that the whole words are visible. One of your subjects breaks up the words here which does not look deliberate.
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