Sound

Regular 
Produces any sort of meaningless sound the caster wishes – the drone of an insect, the distant babble of voices, the clatter of something falling, or anything similar. The spell cannot produce loud noise. It requires no concentration once the spell is cast.

Duration and cost: 1 to create 5 seconds of sound; 2 to create a sound that lasts for a full minute; 1 per minute to maintain.

Item 
Any. Continually produces the specified sound (though Link is often used to turn it on and off). 
Energy cost to create: 50.