If it's visual, we can process it immediately, and make a decision to explore it further or not. But aural takes time. Time to take a sufficiently long sample for us to evaluate, unless it's immediately familiar. For example, 10 seconds of Layla, Baba O'Riley, or Jumpin' Jack Flash, would hook me, but with Joshua Bell, it might take several minutes for me to accept or reject. On the way to work, several minutes is unacceptable delay.

very astute