As per the meaning of the sentence, we are given that in addition to being a Jazzy Tune, MD's hit songs is also recorded by many other bands. So, clearly being a Jazzy tune is the quality of his song that we need to mention.
(A) Besides being a Jazzy tune that the musician himself wrote--> Correct as it is.
(B) Besides aJazzy tune with the musician him self writing it--> Awkward and Unclear
(C) Except a Jazzy tune being written by the musician himself. --> Change in meaning. We need
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(A) Besides being a Jazzy tune that the musician himself wrote--> Correct as it is.
(B) Besides aJazzy tune with the musician him self writing it--> Awkward and Unclear
(C) Except a Jazzy tune being written by the musician himself. --> Change in meaning. We need
...
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