Good grid - a little harsh that putting "silent letters" for the missing silent letters group does not get a point, though?

Very easy because each group was so distinct. Even though I had no idea for 3 of them, the groups were so obvious that it took less than a minute. A better grid would have words that could fit into more than one category.

Mondae
Sorry about the missing silent letters thing I thought most people would pick up on the silent letter thing and just put that as the answer.
Mojopo
The groups did have lots of crossovers like the members of Foo Fighters and Leaders but how often do you see related groups on OC.
Both of you
Thanks for the feedback I shall try again.