<p>Why 33? Partly because that's the number of rotations performed by a vinyl album in one minute, and partly because it takes a lot of songs to tell a story which spans seven decades and five continents - to capture the colour and variety of this shape-shifting genre. This is not a list book, rather each of the 33 songs offers a way into a subject, an artist, an era or an idea.<br><br><br>The book feels vital, in both senses of the word: necessa...