You have probably heard this tune very often. It was written by Spanish composer and guitarist Francisco Tárrega. And yes you got it right: It’s Nokia tune. His music also inspired Mike Oldfield to arrange Tárrega’s tremolo study Recuerdos de la Alhambra for the soundtrack of the film The Killing Fields.
Francisco Tárrega Gran Vals
Recuerdos de la Alhambra
The Killing Fields
A Crime is Afoot 