06-03-2020, 11:04
I’ve found contemporary sheet music online with relative ease. Some pretty obscure stuff too. It won’t be precisely notated like classical music though - or rarely. Mostly the melody or lead line and accompanying chords – sometimes different tablature for different instruments – you’ll just have to search. There are innumerable possible interpretations when it comes to chord progressions, if that's what you mean - and many pop/rock musicians don't read music, so unless there's some sort of clever app that can notate an original piece as heard (which there might be for all I know), I think you may be in search of the lost chord! 
"The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us." ~ Bill Watterson