If retail evolves by becoming more niche so will background music become more specialist to support this trend.
No bland keyboard tinkle will suffice anymore, background music will rise in the consciousness of the experience and form a key contributor of the blend of style and experience for every niche brand presenting itself on the high street or side streets.
Music libraries will need to collate niche music collections for cliens and enable them to develop & form their own playlists.
Additionally libraries will need to provide user interfaces rather than piles of CDs so simpler ways to manage and play in store music will be enabled.