If it is a serpentine belt first try some belt dressing and lube the spring on the tensioning mechanism, sometimes it sticks or does not move in time with the belt stretch as you accelerate. Cars do the same thing but the noise is hidden by the engine compartment. Also check for belt wear on the non pulley side( smooth side) it get polished and can slip some. It will be super shiny and slippery to the touch. It could develops into a problem if left unattended, almost all belt squeals are caused by the tensioner, worn belt or both.
If it is a standard v belt system try some dressing and check that all belts are tight.
Wakina
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