1. A method for mood detection using a mood detection device having a processor comprising: receiving audio data; assigning a user to a predetermined group of users; determining, using the mood detection device, a mood for said audio data based on at least one mood model, wherein said determining includes determining or receiving a union mood model, which corresponds to a mood model for said predetermined group of users, and using said union mood model as mood model for determining said mood; communicating the determined mood to the user; thereafter, receiving user feedback of the user for said determined mood, said user feedback being on a gradual scale and indicative as to whether said determined mood corresponds to a perceived mood of said user for said audio data; and adapting said mood model based on said user feedback.