The Mark II is the first music box that featured this version of the jingle, which is the one most people recognize as it was from 1987 and is still used today (as a digital recording), but there is an earlier version from the 60s that was featured in advertisements.

"The creamiest, dreamiest soft ice cream
You get from Mister Softee
For a refreshing delight supreme
Look for Mister Softee
My milkshakes and my sundaes and my cones are such a treat
Listen for my store on wheels ding-a-ling down the street
The creamiest, dreamiest soft ice cream
You get from Mister Softee
For a refreshing delight supreme
Look for Mister Softee
S-O-F-T Double-E
Mister Softee!"