 Several responses to these arguments are available (see Cohen 2009 for the most developed reply). One might argue that sounds are complex properties, such as pitch-timbre-loudness complexes, instantiated at a time. To account for feature binding, one might hold that such complex properties are ascribed to ordinary objects such as bells and whistles. Or, one might hold that they are particularized properties, such as tropes. To accommodate sounds that survive change through time, a property account could hold that sounds are yet more complex properties that have patterns of change built into their identity conditions. However, any such view differs a great deal from the familiar secondary or sensible quality view pioneered by Locke. Pitch, timbre, and loudness are better candidates for simple sensible features in audition (see section  3.2 Audible Qualities).  