This trusty black-and-burgundy record book has been my guitar practice sidekick for years. The numbered green pages create this oddly satisfying grid where I log daily practice hours - seeing those numbers stack up week after week keeps me motivated like a musical fitness tracker.
The sewn binding survives being tossed in my gig bag constantly, though I do miss the bookmark ribbon they used to include (noticed it disappeared around year 8 of using these). What makes it special is the margin space - I scribble chord diagrams there during lessons, and later those messy notes become little milestones of progress.
Recently started using a second one for woodworking projects. The acid-free paper actually preserves pencil sketches better than my fancy sketchbook when I'm covered in sawdust. Pro tip: The burgundy corners hide coffee stains brilliantly - not that I'd know from experience or anything...