This video shows me tapping harmonics on the slide at Ramponi Park, the site of my next remix. I thought it was a good demonstration of what I wrote about earlier on the variety of sounds produced by a structure.
You can also see I've been trying a new variety of cheap piezo pick-up. It didn't sound too bad but seemed to be broken after visiting the park. Should've guessed it would be crap because it has the word 'professional' in the title on the packet.