Sing Along is one of my favorite Gottlieb wedgeheads - beautiful theme execution and great, challenging gameplay.
http://ipdb.org/machine.cgi?id=2160
CORRECTION: I said this was a Parker art package. Couldn't have been more wrong. It was Art Stenholm. My apologies.
I also speak a bit about Duncan Brown's excellent upcoming seminar at Expo 2016:
"From The Lost Playfield Drawings Of Harry Williams: A Pinball Machine
40 Years In The Making"
He is making a brand new EM whitewood from the drawings of Harry Williams. Wonderful!
https://groups.google.com/forum/#!topic/rec.games.pinball/_ee2jtINuCc
Next week is the York show - come to Bingo Row and compete for a free t-shirt, illustrated by Ryan Claytor!