What genres of music attract the strongest musicians?

I would say classical. It requires a high level of skill and training to master most any classical piece.

You left out progressive rock/metal, but that's got a relationship to jazz.

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What genres of music attract the strongest musicians?

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If we're talking pure musicianship (e.g. technical ability, speed proficiency, improvisation, etc.), then jazz and each of its offshoots has the greatest collection of musicians.

People are going to dismiss me for saying this but heavy music is often filled with great musicians because of how damn bombastic and over-the-top it has to be. From jazz we get progressive rock/metal which has some of the most impressive rhythm players you will ever see.

Also, believe it or not, death metal has some of the most technically-skilled musicians you will ever find. Many of them implement a jazz fusion into their music which takes the music in an entirely different direction.

If we are talking vocalists then obviously operatic singers are the most impressive. However, power metal often has its fair share of classically trained singers with just as impressive of a vocal range as their operatic counterparts.