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Cover picture: Spectrograms of sound excerpts used to elicit cerebral blood flow increases in auditory object-sensitive areas of human auditory cortex. Each panel represents frequency as a function of time; color scale indicates amplitude (purple for low; yellow for high). The panels in the left column show examples of individual environmental sounds, derived from machinery, animal cries, flowing water, musical instruments, etc., which were time-reversed and filtered to render them difficult to identify. The right column represents the simultaneous addition of 45 such sounds on each trial, rendering the individual sounds indistinct and the composite sound identical across trials. Neural activity in the right superior temporal sulcus was greatest to the individual distinct sounds and was progressively decreased as the sounds were mixed together, revealing that this region likely forms part of an anteroventral processing stream sensitive to features of auditory objects. For details, see the article by Zatorre et al. in this issue (pages 3637-3642).