Re: Why courses?
The two strings add sustain to the instrument so that it gets more sound/volume for its size. And as Paul said, they're extras in case one snaps--something I have had to deal with several times already. Also, it makes tremolo louder (so far as I can tell).
"When I heard what Socrates had done on the lyre, I wished indeed even [I had done] that...but certainly I labored hard in letters!" - Cicero, "Cato the Elder on Old Age"
Weber Gallatin Mahogany F
19th Century Ferrari(?) Bowlback
Early 20th Century British Mandoline-Banjo & Deering Goodtime Tenor
1960s Harmony Baritone Ukelele
The Magic Fluke Flea Soprano Ukelele (in 5ths!)
1910 German Stradivarius 1717 copy, unknown maker
1890(?) German Stradivarius 1725 copy, G.A. Pfreztschner, maker
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