Microphones already do that for you, they just have a specific process. Most electroacoustic systems are transducers meaning they change one type of energy into another. Changes in air pressure from sound cause a coil to produce a magnetic field that creates an electric signal. Simply converting sound pressure/vibrations into electricity would require a piezoelectric material such as quartz. Piezoelectric matter convert pressure into voltage of a certain proportion (an car cigarette lighter is a perfect example of piezoelectricity at work). However one needs quite a tremendous amount of sound pressure to produce a significant amount of voltage. A person shouting produces about .001W of energy, thus you would probably need 50,000 people to power a 50W lightbulb.
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