Not that if you establish a pseudonym another sites first, like Lady Gaga, you can use that psuedonym on G+. You can also engage in G+ as a Plus Page as though

Not that if you establish a pseudonym another sites first, like Lady Gaga, you can use that psuedonym on G+. You can also engage in G+ as a Plus Page as though you are a rock band, with just about all the features of a personal user. But you do need have a person account to own the page, but I think you can make the owership a secret that only Google knows.