Yes, they were singing standing at one point and some even with their eyes closed. They were NOT asked to dance or "connect" with the audience. The entire "performance" was in their VOICES only.
And believe me, even the guy who had to leave yesterday was terrific!
(Surprisingly, he too sang "Tu hai aasmaan mein" like Anubhav did when he went out)
Now, if only the timings were at an earthly hour, instead of 10 p.m., I would have certainly switched over to Zee!!!