If you're referring to the song from Willy Wonka & The Chocolate Factory, (Pure Imagination) it's Gene Wilder. Or perhaps a very good impersonator, but I doubt it.
Cat Stevens
gene wilder
Rhythm of Love Plain White T
If you are reffering to the one with the silky orange cloth, it's Nick Drake.
Gene Wilder
jean claude
Joel Grey
Buddy Holly sings that song!
Cat Stevens
Apparently the song was custom made for the commercial by some group called sonic union. So... there ya go.
The New Seekers
Laurence Fishburne as Morpheus sings in the new Kia commercial. The commercial debuted during the Super Bowl in February 2014.