For the mash : Rolling Stones (Sticky Fingers), Kinks, Talking Heads, Allman Bros. All improve mash efficiency
For the boil: Van Morrison, Stevie Ray Vaughn : improves hops utilization.
Scientifically proven.
Calibrate your thermometers regularly. I got lazy and skipped this for a while. The dial thermometer I use for mash was off by about 9 degrees which I didn't discover until three batches. Ugh.