Yes, I have found those to be very helpful! However, some of them I can't quite understand (my own beginner-ness with javascript probably to blame) and they also can be somewhat difficult to navigate. For instance, I've just gone through and figured out how to connect staves for a piano piece, and then how to draw bar lines, but now I'm stuck on drawing a new connector between the two staves for the subsequent bar lines. I suspect there's a simpler solution to do this automatically, rather than putting in each bar in each stave and each connector separately, but I have to search through the tests and find what I'm looking for! Same happened to me with automatic beaming....I couldn't find or figure out the test for automatic beaming, so I wrote my own auto-beam function, but then, that of course, was before I had figured out how to write multiple bars of music, so I keep needing to update it every time I learn something new. If there's anywhere where someone, say, has just posted a few measures of piano music, I would be able to figure these things out much more quickly, so if they exist, let me know! Thanks!