I didn't anticipate running to Steve Reich. It was only after I got the album that it occured to me it would be great excerise music. I think it's the percussion that works for me, so Vivaldi might not. I'd like to know what you think of the Reich if you have the inclination to explore. You seem to have excellent taste in music. I'm working on the perfect work-out playlist, so please send the names of your top recommendations. I'm finding myself a little bored with the same stuff I've been listening to. I have no aforementioned familiarity requirement!