I play a number of old musical instruments from around the 1920s/1930s; diatonic accordions and a concertina. The construction of the bellows is not dissimilar

I play a number of old musical instruments from around the 1920s/1930s; diatonic accordions and a concertina. The construction of the bellows is not dissimilar from that of older books, as they're made of cardboard, leather, and hide glue. Interestingly the accordions don't really have much of a smell (except one which has cedar reedblocks, which is delicious), but the concertina smells absolutely fantastic and honestly it's a huge part of the instrument for me. If I haven't played it in a while it's one of the first things I notice again when I get it out, and my girlfriend regularly mentions how great it smells as well. Not a huge surprise that we both love physical books as well :)