I have yet to find music of any flavor that has amazed me as much as the Late Quartets when I first encountered them. I remember the moment I first heard them on the radio, and nearly had to pull over to take it all in. That would not have been allowed on DC's Memorial Bridge, so I drove on, in awe.
I still am in awe. I listened for years to the Guarneri Quartet's version, but am now exploring the much-recommended Takács version.