I use my N90 as a player all the time. How many times have I tried the players until I stopped at this. An excellent player for the Symbian platform, open source.
I was attracted by three things that are not present in all music players. Firstly, it is free. Absolutely no attachments for any mobile S-devices. Secondly, it supports a bunch of formats: ogg, oga, flac, mp3, aac, mp4, m4a, mid, amr. Well, it is especially worth noting the structure of file sorting: it scans all available space, finds supported files and sorts them by several criteria, by composition name, albums, artists, genres, directories, by file name. Plus, if there are playlist files (pls, m3u), then it also sorts by them. This very convenient sorting instantly makes up a mobile music library. The advantages of this program do not end with these three points. Playback can occur in a row, looped, in random order, and resume at the last position when the program starts. The keys are configured for all actions that can be performed with the player. The interface is transformed by skins. There is even its own alarm clock. When playing, there are volume adjustment modes (auto-zoom or anti-aliasing), fast rewind. The program works without problems in UIQ, Series 60, Series 60 MMF, Series 60 V3, Series 80, Series 90 devices.
I highly recommend that all owners of devices on the above platforms try OggPlay in action.