The study of musical timbre by Bailes (2007) raises important questions concerning the relative ease of imaging complex perceptual attributes such as timbre, compared to more unidimensional attributes. I also raise the issue of individual differences in auditory imagery ability, especially for timbre.
Empirical Musicology Review
Halpern, Andrea. "Commentary on "Timbre as an Elusive Component of Imagery for Music" by Freya Bailes." Empirical Musicology Review (2007) : 31-33.