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The top right corner of each mood picture contains a button, which
takes the user to the cascade mode of the prototype (Fig. 11.3). The
cascade mode displays all the mood pictures simultaneously for easy mood
selection. When the user taps on a certain picture, that picture is selected
and displayed in the full screen mode.
As well as tapping, another way to change the mood (and thus also the
music) is to swipe the screen in different directions. Swiping to the left
from the middle picture in Fig. 11.3 would bring the blue picture to the
screen. When the user changes the mood, a new playlist of music
recommendations is also generated and the playback of the previous song
is stopped.
Music recommendation system
To generate music recommendations, the prototype relied on a new and
enhanced version of SuperMusic (Lehtiniemi 2008), which is a content-
based music recommendation system developed at the Nokia Research
Centre. The system uses textual metadata tags (describing genre and style)
and audio signal processing; the similarity in terms of metadata tags is
calculated at the artist level. For more details on the music
recommendation algorithms, see (Holm, Lehtiniemi & Eronen 2010).
In the prototype, each musical genre was represented with a set of
prototypical seed songs, manually selected to be highly representative of
the corresponding genres. When creating a playlist for a combination of
musical genres, a seed song from each genre was first selected randomly
from the corresponding set. After this, a playlist of recommendations for
each song was fetched and interleaved with the final playlist.
Built-in mood pictures and seed songs
The prototype featured seven different built-in mood pictures with
associated music, i.e., the seed songs. The mood pictures were designed to
cover three parts of Thayer's/Russell's model of emotions: top right,
bottom right, and bottom left, with the emphasis being on the right side.
The pictures were designed to match the potential daily situations and
activities of the target user group. Each picture also included a custom-
made animation layer to enhance the mood compared to static pictures.
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