As a general rule I never take more than 2 lenses with me, and have found that outdoors the 10-24 and 18-135 are an excellent combination. Both get a lot of use, and throughout their ranges.
Indoors / low light I tend to choose 2 from the 23, 35, 56, and 90. But if I was forced to reduce the number of lenses I could lose the 35 and, if someone held a gun to my head, the 90 (which is a fantastic lens but for me a bit of an indulgence).
So my cut down lens collection that my experience shows I would be very happy with is the 10-24, 18-135, 23 and 56 (although I would cry at night thinking about the 90). Swap the 23 for the x100s and we have arrived at pretty much the same place.
Ah and we reach the limit of my saxaphone knowledge as quickly as I had anticipated
I love photography for its immediacy and the fact that I can get instant results without having to rely on 7 other people being in the same place at the same time. However music is, and always will be my first love.