you tube has about every old country song you could want to hear. I sometimes think I am the only old country fan but sattelite radio and classic country stations tell me a different story.
Country is huge, I've heard it dwarfs the remnants of Rock and Roll. I enjoy both.
Glen became even more popular, in a way, as he got old. Like Johnny Cash who went so far as to become a bit of a hit in New Age circles, covering very introspective non-country songs.
I've read his 70th+ album 2008 "Meet Glen Campbell" was "covering tracks from artists such as Travis, U2, Tom Petty and the Heartbreakers, Jackson Browne and Foo Fighters".
Here's a heartfelt These Days from Jackson Browne/Greg Allman:
Glen Campbell - These Days