Create a "person" infobox template (maybe separate ones for musicians, producers, etc.)
Create better infobox templates for songs, singles and albums.
Expand articles on band members to include a detailed biography
Expand song/album articles to include detailed notes on writing and recording, along with information about live renditions (such as in the Estranged article).
Add photo galleries to band member articles.
Replace low quality/unfitting images with high quality scans. Eg. Wiki street of dreams.jpg.