Whitney Houston and the art of melisma
15 February 2012 Last updated at 12:09 GMT
Whitney Houston will be remembered as a master of "melisma".
The singer had an ability to pack a series of different notes into a single syllable.
For example, an early "I" in Whitney Houston's I Will Always Love You takes nearly six seconds to sing.
The technique is repeated throughout the song, most pronouncedly on every "I" and "you".
In this clip, opera singer Sarah-Jane Dale demonstrates the use of melisma. It is followed by an extract from Whitney Houston's version of I Will Always Love You.