Learn About Music Theory with This Easy to Understand Online Book
"If
you've always wanted to learn more about song writing and the structure
of music, but don't know where to start, this free online book is
filled to the brim with pages that make understanding music theory easy." according to Lifehacker.
Toby W. Rush's "Music Theory for Musicians and Normal People"
covers a massive range of topics like pitch, rhythm, scales, intervals,
and harmonics. The online book itself is more arranged as a collection
of high-quality PDFs that offer diagrams, notes, and tips for
everything music theory related. There's around 50 PDFs to go over, but
each one could make for a useful reference printout if there was a
specific topic you're interested in.
Learning to play music can have a number of benefits, and though music theory isn't required for doing so, it can certainly help if you want to create your own tunes.
Source: Lifehacker