Vivaldi! Or other classics of the same period. It's been proven that the ~60 beats/minute of the music sets the brain into its most active mode. I taped some Vivaldi tunes for my wife, a sixth grade teacher (now retired). She played them quietly before class and between classes and saw an obvious difference in her classes attention and accomplishments.
However, I prefer Bill Evans, Dave Brubeck, and a few similar composers while I tie. The sounds of the River Warfe or River Ure on Oliver Edwards DVDs help me concentrate on good North Country Spiders. YMMV.

Bill