Music searcher / player for on-demand music streaming sites

I want to have music player realised, which plays music as obtained from [[login to view URL]][1] or [[login to view URL]][2]. It must be possible to search for an album or an artist or a track. See the Grooveshark site (under Developers) for more info; or see the spotify site (under Developers) for more info. The player must preferrably be built using Delphi. If you can realise it in another language, that is fine, but the it must be an application which I can call from my Delphi application (by using SendMessage). My application can play the stream.