i've been trying on my own to make one, and it's really difficult but rewarding to get some notes right, but i just dont have the knack like you Here is "Over the Garden Wall - Theme Song (Full Version )":
GAEFGGFG
AEDDCCBA
The entire bottom line is low notes. The last G on the top line is low, and all E's are low. Sorry if that's confusing. I can try making it with upper and lower case letters if you would prefer.
If I'm understanding your request correctly, you wanted just the notes without the timing, perhaps so that you can change the timing on your own. So that's what I did. If I was mistaken, please let me know what you'd like me to do differently, and I'll be happy to work on it some more.
Here is "Aphex Twin - Jynweythek Ylow":
G---G---
C---G---
C and last G are low, first two G's are high.
This was a tricky one. Let me know if you'd like me to try it again and do something differently.
Oh, right, the one that goes "beep beep boop bop beep." XD
Here is "Electric Zoo":
GGab-gB-
GGab-gB-
Uppercase letters are high, lowercase letters are low.

Here is "Petula Clark Downtown. original version":
G---E---
DEFE-CD-
High G, all other notes low.