4K HD Wallpaper: Vinyl Player
Probably not many people now days listen music on vinyl, but here's a 4K picture with a player that can be saved under CC By license to be used as desktop backgrounds and lock screen phones.
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x1536 (compatible with almost all tablets)