For questions asking about the creation of or propagation of sound. Questions about how creatures or beings vocalize should use the [vocalizations] tag. Questions about music should use the [music] tag.
For questions asking about the creation and propagation of sound (compression waves) in any medium. Questions using this tag should be asking about general world rules such as the nature of sound in a specified atmosphere or the consequence of sound given a magical event.
Questions asking about how creatures or beings speak or vocalize should not use this tag, but should instead us the vocalizations tag.
Questions asking about music should not use this tag, but should use the music tag instead.