Just a slight correction. America didnt do Muskrat Love...it was Captain and Tenille. America did it also. From Wikipedia:
America recorded "Muskrat Love" for their 1973 album Hat Trick, marking the second time the band had recorded a song not written by a member of America.
America's "A Horse With No Name" was arguably the biggest hit of 1972, but I've never understood its appeal. The melody consists of about five notes, and the lyrics make no sense.
Speaking of 1972, here are some of my favorite songs from that year: