The J-Male Singers and the non-J Female Singers

The current J-Male Singers' songs were kept playing in my playlist. Ops.... not JJ, not J, not Jolin etc.
1. James Blunt
2. Jamie Cullum
3. Jason Mraz
4. John Legend
5. Jack Johnson
6. John Mayer

The female list:
1. Madeline Peyroux
2. Corrine Bailey Rae
3. Stacey Kent