I found this online and thought it could be useful to a number of people who come to the GI forum looking for help with theory at a range of levels. It's quite nicely written and although a quick scan of this forum will show that almost any aspect of theory can be discussed at length, this little book is certainly not a bad place to start for those who want a solid background on which to base further study and investigation. Note that the book was originally in three separate parts (Basic, Intermediate, Advanced) to keep filesizes down, but I merged it into one PDF of eighty pages as the size of this single file is very reasonable these days with current connection speeds available to most Internet users. The descriptions Basic, Intermediate and Advanced are relative to each other and of course there are aspects of theory that aren't covered (for example, the mathematics of temperament and hence how we get our usual chromatic scale). It's also somewhat guitar-orientated and inevitably there's a few typos here and there. But hey, it's only eighty pages and it's FREE. Music Theory Basic Level (the one in my signature) Music Theory Intermediate Music Theory Advanced I'm sure it's okay to post this here as the information can be freely downloaded, used and copied for educational and non-profit purposes (it says so in the introduction). Acknowledgement is due to "Eowyn" at www.mysongbook.com I hope some of you find this useful and interesting - enjoy the read!