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Opens flat for playing music
No gutter for music to disappear within
Pages won’t be lost as easily as unbound sheets of paper
Cons:
Swelling at the spine can cause damage, if unprotectedThicker spine than page ends
Unsupported sewing, with untested durability (spine protection should help)
Three needles of thread are easily tangled during binding
And, it’s a tad complicated to learn
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