Show HN: Syncopate – free sheet music with piano play-along

It’s my website where I host my arrangements of public domain music completely for free. Right now there are only arrangements for my instrument, tuba, but I’d love to add more instruments like ocarina or bassoon in the future. I started this because over the 10 years I have played tuba, I probably went through all free tuba resources on the internet multiple times and many pieces I wanted to play I did not even find for tuba.I’m working completely alone on this, so to be honest with you: I got a lot of AI help. Basically the pipeline for getting a public domain piece onto my website is downloading a well scanned score from a library like IMSLP, then a couple of Claude subagents read through it bar by bar and write the tuba part from it. A script checks for clashes with the piano accompaniment and a separate Claude session proofreads the result against the scan. Then I play it through myself, look through the sheet music and double check weird passages with other sources on the internet. Most of the time there are maybe 2 errors left in a big piece like the Can-Can, so the subagents already do a great job!The sheet music player is rendered by alphaTab. It had some bugs that I…