If I had been serious about music when I was young, I might be/would be/could be participating in the concert now. (the concert is happening now)
Do all the variations sound natural?
I think you could go with either "might" or "could" since both suggest possibility. I would not use "would" because that is too definite. This is all an "if" discussion.
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I think you could go with either "might" or "could" since both suggest possibility. I would not use "would" because that is too definite. This is all an "if" discussion.