Shinigamiyoko - Yeah. But MusicBrainz says that the correct spelling is this one. Not just iTunes like you wrote. Without space between NANA and Black Stones. I wonder which one is really the poper one :)
Laurizm is right, this is sorta (look below) the name she uses for her NANA songs. The only other thing is that the other spelling, ANNA TSUCHIYA inspi' NANA (BLACK STONES), with a space in between the NANA and the (BLACK STONES) has about 140,000 plays compared to the 14,500 plays of this one. The bio should probably say "The correct tag is ANNA TSUCHIYA inspi' NANA (BLACK STONES)", because she does non NANA related songs under the "ANNA TSUCHIYA" tag.
It's likely that a space should go in between NANA and (BLACK STONES), as that artist title has about 9 times the plays as this one... This is the way US iTunes displays her name though. I do love her singing, and I'm eternally beating myself up for being able to, but not going to her AX '07 concert. She's amazing. ^_^