Sounds are the objects of auditory experience. They are the individual things that we can attend to in auditory experience. These objects of auditory experience instantiate the acoustic properties of pitch, loudness, and timbre. They appear to be individual things in which these acoustic properties inhere. They do not appear to be properties of material objects in the way that, say, colours appear to be properties of material objects (I say more about this below); nor do they appear to be parts of material objects.