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<p>Major may matter if
- it is directly relevant to the job (e.g. computer science major for a computer software development job)
- it indicates a skill that is relevant to job (e.g. math and physics majors are sometimes considered for computer software development jobs because mathematical and logical thinking often translates to being able to work on computer software)</p>
<p>Workload of the major in college likely has little to do with it. Biology and music may be high workload in college compared to math, but math majors have better job prospects.</p>