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A singer is a person who uses their voice to produce musical sounds, typically by performing songs or vocal pieces. Singers may work in various genres, such as pop, classical, jazz, or opera, and can perform solo or as part of a group or choir. They use techniques like pitch control, rhythm, and expression to convey emotions and tell stories through their singing. Singers often practice to develop their vocal skills and may perform live in concerts, record music in studios, or participate in theatrical productions.

A professor is an academic professional who teaches at a university or college and is often involved in research within a specific field of study. Professors typically hold advanced degrees, such as a Ph.D., and have significant experience and expertise in their subject. They are responsible for designing and delivering courses, supervising student research, and publishing academic work. Professors may hold different ranks, such as assistant professor, associate professor, or full professor, based on their experience, achievements, and contributions to their field. They play an essential role in shaping academic curricula and mentoring students.