"I went down to the crossroads....."
The "down" is on the an just before the 1 of the first beat of the first bar of the 12 bar. ie on the A chord.
So the I went is the lead in
1 an 2 an 3 I went down
(with the 'I' on the an of 3, the 'went' on 4 and the 'down' on an of 4).
Clap that rhythm.
If you clap it slowly you'll get ......... slow hand clap ton
