Berklee Contemporary Music Notation Pdf [OFFICIAL]
The most comprehensive version is (ISBN: 978-0876392065) by Jonathan Feist. While this is a physical book, it often comes with a digital download code for a supplementary PDF focused on contemporary notations (synth, guitar, and rhythm section specifics). You can find this via Hal Leonard or Amazon.
The visual "white space" is as important as the black notes. Berklee Contemporary Music Notation Pdf