I would have thought it cool. I liked it back in the day when you saw a folk singer, a metal band, some progsters and a reggae band at one festival - nowadays everything is typecast, but if I'm honest I don't really enjoy eight hours of non-stop reggae, or non-stop heavy metal or non-stop prog or non-stop folk or eight hours of anything non-stop. Eight hours of Lana would make me reach for Prozac - like most people I guess.
But then while I'm writing this my office stereo plays BCR's Remember (Sha-la-la) and I'm enjoying that (always dug the Rollers, even when as a Status Quo/Sweet/Deep Purple guy you weren't really allowed to do so), so my music tastes have always been, well, dysfunctionally eclectic!