There's the fast passage in the development in the first movement of Shostakovitch No. 5 - fast downward then upward scale passage with different notes going each way.
Bottom of page 3 of Death and Transfiguration by R. Strauss has a fast passage that repeatedly starts on low-Eb.
The Db scale passage in the intro of Mozart No. 39
Ach!! the storm scene of Beethoven 6th (unless you choose to fake it like the other 95% of us)Up and down the C-string until the string heats up from friction!
The end of the development of Beethoven No. 3 has many leaps.
Somewhere in Bach's Magnificat oratorio there is a 1/16 note passage starting on low-C# that goes something like C# D E C#, D E F# D, E F# G# E, F# G # A F# etc. This passage happens 2 or 3 times in the movement.
If you don't have a capo for the low-D, the fast movement of Corelli's Christmas Concerto is rather challenging as there are many jumps from low-D to G.
But start out with Bach's Brandenburg No. 3 first so the above stuff doesn't scare you off. There are a few challenges there to hit the extension range stuff cleanly.
What about Till Eulenspiegel? That's always the first excerpt I think of when I try extensions.
I'm in the market for an extension, and I really can't decide what I want. It's frustrating that there really isn't a surefire best way to go-machine v. gated stick v. stick w/ E-stop...
After reading some of these, I'm beginning to think that a gated stick may be the best compromise, particularly with a thumb seat carved in. Pay attention to your gate changes, keep them efficient, and it seems more than doable. Anything I should be wary of?