Start adding discoverability / credit data

[BBGuy]

• Quick and dirty at this point
• Also see #24
• Metadata at this point is same for all asset types (song, clip, sample)
• Look at Metable and Musicbrainz
• We are interested in expanding the instrument taxonomy & possibly an instrument usage taxonomy (like alternative tuning).
• Genre, mood, key, bpm
• Add a high level taxonomy for assets - Song, embedded track, track (can be used in other songs) - this will be useful for discoverability.

[BBGuy]

We need to add categorisation to assets where an assets can be a:

• Track - i.e. song / album track
• Clip (Embedded track) - John Deacon Bass line

This can later be extended to include Albums Video ..... see https://moqups.com/iAugur/kehhWu7C/p:a84ce6767