Out of all the songs you've heard, which band/artist has had a song that has been the biggest challenge for you to learn. It can also be a song that was so hard you just couldn't do it.
For Me:
Starship Trooper, Part II - YES
Signe - Eric Clapton
Rude Mood - Stevie Ray Vaughan & Double Trouble
So far Metallica - The God That Failed.

I've got about a quarter of the solo down.
Populus vult decipi. Decipiatur.

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If you cut down on these costs students won't learn so well, effecting the "quality"...