even today, if you ask me to sing a Ghantasala song, I will jump and sing 'pushpavilapamu..' simply melodious...
Actually, when I was a small child, Ghantasala used to come to Tirupathi to sing carnatic music in Thyagaraja Music concerts organised by my grandfather....but ofcourse, that time itself, he used to bring synthesizer (new that time) for his concerts....his concerts (always free) used to be fully packed....