I just wanted to add on more to your thoughts: when I play piano with sheet music, I "chunk" as you mention, but I also look ahead anywhere from like one measur

I just wanted to add on more to your thoughts: when I play piano with sheet music, I "chunk" as you mention, but I also look ahead anywhere from like one measure to an entire page to refresh my memory and see what I need to play next, and/or how I should transition from one section to the next. I also find that these definite divisions by lines and pages of music help memorizing and visualizing what to play. I would love it if there was an app that listened along and flipped/shifted pages over automatically, but marquee scrolling would be disastrous to the way I read sheet music. (Disclaimer: I've been playing piano for over 15 years of my 21 year existence on this planet, is that enough to comment on my personal preferences? ;) ) On the other hand, throughout the years I spent singing in choirs and with specific situations like guitar hero, a marquee style method of presentation never posed a problem as long as I could see at least a measure or two ahead at a time. Likely because of the information density you mention - singing and guitar hero never felt as demanding as playing piano.