Of particular note is that in this recording, Nageswara Rao is performing completely solo -- no percussion, no veena "support," and no drone. I remember there was a very interesting example of an old 78rpm disk on the Excavated Shellac blog a few years ago which had the same configuration and at that time I found it rather remarkable.
Also of great interest is a Carnatic piece played in a tala other than Adi (see below). My personal estimate is about 95% of South Indian classical music is in Adi tala.
Kriti (song): "Raghuvamsa" (by Patnam - Subramanyan - Iyer)
Kriti: "Parakunikelara" (by Tyagaraja)
Tala: Misra Chapu