Don't carry a MP3 player or anything but often find a song gets stuck in ma head and gets repeated over & over again - can get a bit monotonous after the first couple of hundred k's. Also been known to tap hand on knee or handlebars, nod head like an idiot etc to whatever's "playing".
Certain songs can jump into your head depending on how you're riding: Bat out of Hell, Turn the Page etc...
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