Piero Umiliani's classic track (1968), as made famous by David Mahna MacKay (in 1969 - more on him in the next post), Sesame Street (1969), Sesamstraße (?) and, last but not least, the Muppets (e.g. 1976) … Apparently, Jim Henson c.s. have recorded several versions, most of them by the character Bip Bippadotta ... but Sandra Bullock did her part too - see http://muppet.wikia.com/wiki/Mahna_Mahna_(song) for more on all that!