I have sustained an injury in my right hand from playing the piano (my doctor diagnosed it as "tennis elbow"). Where can I find pieces that are suitable for left hand only? Hopefully they are sorted by difficulty.
There are a number of pieces for left-hand only piano. I'm only familiar with CPE Bach's Solfegietto (I'm not sure if it was originally written for left-hand piano or 2-hand piano), but a quick IMSLP search brings up a sizeable list of left-hand pieces.
Unfortunately, to my knowledge, IMSLP has no indication of the level of the pieces; you'll have to eyeball it yourself.