I'm running the same MB version you are, gaiastar, under Windows 7 and 10. Mine do work the way you suggest, under both W7 and 10: hitting the i key sequentially, for instance; though I do have to wait a couple of seconds between pushing the key, it does take me to the second i artist, third, etc. Interestingly, it also takes me to one artist beyond the letter -to the first J artist, for instance, then it goes back to the first i artist. I'll probably keep mouse-scrolling or using the arrows, but it's another good thing to learn. Try your method with a second or two of patience. BTW, with arrows after the letter, there is no need to wait at all.