Why should it be? I am saddened that a singer has died (anyone would be) but it is not a state occasion and his funeral should be a private affair i.m.o..
Most people are not concerned, more than having a feeling of regret at loss of talent and, probably, relief that his drug habit did not bring him into disrepute. A 'pop icon' is not all that important in the scheme of things really, sorry.
Princess Diana had a Royal Ceremonial Funeral, as did the Queen Mum....State ones are for the monarch, princes and princesses of the line and folk who have given exceptional service to the nation.
Why would anyone want to be a voyeur to a private funeral?