Sometimes I listen to music right before a songwriting session. Sometimes for ideas, sometimes just because I need that extra boost from hearing something I like.
The song that directly preceded tonight's improv? Melanie C's "Goin' Down" courtesy of last.fm's "play my library" radio station.
I was goofing around trying to match chords to the song. And probably I didn't even come close. But I did come up with something I liked enough to use as a starting point for the improv.