The Nokia Ringtones are available in different melodies which are used in Nokia mobile phones, some comes by default, the tones are given by Bar or measure which is a segment of time defined as a given number of beats in a particular duration from Francisco Tarrega's Gran Vals, Nokia clams it as sound trademark. Nokia can help you with your ringtones search, they have several ringtones, which you looking for it in different types like

Some of the pop Nokia ringtones are:
Justin Timberlake - Cry Me a River
Avril Lavigne - Sk8er Boi
Big Brovaz - Its OK
Busted - Year 3000
Christina Aguilera - Dirty

The top Classic ringtones are:
All Saints - Black Coffee
Aha - Take on me
Atomic Kitten - Eternal Flame
Atomic Kitten - Last Goodbye
Atomic Kitten - The Tide Is High
Big Brovaz - New flow