This is fun!
There is a music format called abc used to share tunes over the internet as plain text files that can be converted to notation. This is most useful for folk music enthusiasts such as fiddlers, guitarists, penny whistlers, accordionists, etc., who deal mainly with a melody line and possibly chord symbols (abc apparently doesn’t work for multiple staves).
Here is an example of a Scottish tune:
X:1
T:Rowan Tree
O:Scottish
R:Slow air
M:4/4
K:A
A>B|\
c3c c2B2|ce3 e2a2|f3e f2a2|f3e e2 A>B|\
c3c c2B2|ce3 f3e|ec3 B3c|A6 ::
e2|\
(e2 e)>a (a2 a)>g|g2f2 f2a2|\
e3f fedc|(c2 c)d/>c/ B2A>B|\
c3c c2B2|ce3 f3e|ec3 B3c|A6 
The text in bold, above, can be pasted into the converter box at this site to get notation. Afterwards, there are options to download a PDF or MIDI file of the tune.
Click here for an introduction to abc and here for some tune collections, there’s even a klezmer one. (Each new tune in a long file of tunes starts with “X:__,” the converter site will only display one tune at a time. Other shareware and freeware abc programs will display multiple tunes per page of notation.)
