As Guest Guest said, the black Yamaha Paul Simon plays is a high strung. I seldom see him play a standard stringing any more.
Kieth Richards talks about "putting a little angel dust on this track". He means using a High Strung.
Ian Tamblyn almost always brings a high strung Harmony Sovreign on stage and plays it for a few tunes. He's the only person I've ever heard play one solo.

I have an old Yamaha that I keep strung this way. I buy a light guage twelve string set and use the high strings on the Yamaha and the regular strings on my wife's '21 O-18. I have broken a 3rd string and replaced it with a regular G string and I found for melody finger-picking this worked well. I did fill the nut slots with super glue.

Thanks for your input to this thread Mooh.