When Kanno worked on her albums, she did them hiring several vocal artists. However, several people who know Kanno's work know she composed the tunes for Maaya Sakamoto's first 5 albums (up until Lucy, I believe). Maaya decided to venture out on her own afterwards, but the music was inspirational (and filled with backwards messages.) I still think Kanno deserves the majority of the credit for making and seeing through with these albums. They took a lot of effort to compose (Shinjite, kudasai; I know. I arrange music in my spare time.)
Besides, the music written by Kanno attracted my company. Please continue to give tribute to Kanno by buying all her albums, even the sounndtracks for things like Brain Power'd, Turn-A-Gundam, etc.
Thanks a lot! She's bound to appreciate it!