About the mason's Apron.If you are sheet music readers... the link below takes you to a site with music for a number of traditional tunes and some other nice music links as well... the sheet music, and ABA forms are there along with a mediaplayer playable midi file.
http://www.leeds.ac.uk/music/Info/RRTuneBk/RRtunes3/00/00000083.html
Cheers WGD