Possible Clues:

• Photo groups on Facebook
• Whole set of left out Drifters' records
• Records a pound, extraordinary sum
• Audiophile's "vinyl"
• Collections of photographs; records
• Books with blank pages to be filled with photographs or stamps, say
• Collections of plastic measurably needing year to melt away
• Musical releases
• '19,' '21' and '25,' for Adele
• Collections of groovy sounds?