Hi everybody - first post. Can anyone recommend a good music theory book I can buy. I am particularly keen on learning about the theory of harmony, how it works, how to put chords to aline of music, how to harmonise a line of music theoretically. I have put chords to a melody by trial and error but would like to know how to do it theoretically. Any titles would be helpful along with publisher and ISBN if poss.

Many thanks

Lostchord

Try Harmony in Practice by Anna Butterorth
ISBN: 1854728334
It is published by ASBRM

There is an accompanying answer book:
Title - Harmony in Practice: Answer Book
ISBN: 1854729926
Also published by ABRSM

You don't say how old you are or what your experience is. However, why not start here http://www.musictheory.net/index.html

Many thanks to those who gave advice on sources of information on theory of harmony books. I'll try these out.

Lostchord

Many thanks for the advice - I'll give it a go.

Lostchord