How can I scan sheet music?
With a scanner right in your smart phone. I use ScannerPro and I may have paid as much as 5$ but no more for it. There are probably at least a dozen good scanner apps. You scan it just like taking a picture, and then it instantly allows you to crop it or adjust the scan. If you want to add more pages and save them as one pdf you can.
Comes out perfectly and then just send it right via bluetooth to most printers if you need to print it out. Works great and is super easy!