scat

On the first three song samples the warm up version of the song is followed by the vocal style version:

It Don't Mean a Thing: The vocal style version demonstrates scat singing using pentatonic scales	HiFi	LoFi
Baby Baby All the Time: The vocal style version demonstrates phrasing	HiFi	LoFi
So Nice (Summer Samba): The vocal style version demonstrates substitution notes, scoops and grace notes	HiFi	LoFi