Not absolutely certain, but could swear that music heard on my bike at speed changes pitch with a rapid acceleration or deceleration. It seems much more noticable on some music than others. But at times I can hear a definite changing of the pitch of the well known notes as my speed changes. If I am not crazy, I assume this is related to the Doppler effect, or to to go probably too far, the space-time part of physics. I am a musician, so I am pretty sensitive to pitch. Science, not so much. Has anyone else noticed this? Anyone have a scientific evaluation of the phenomom? And no, I have not been smoking anything.