Hey gang . . .

Please forgive my monumental embarrasing ignorance
but I'm new to this forum and I have a question.

I know who Brendan O'brien is, and Bob Clearmountain,
but who are TLA and CLA and can you provide some
favorite examples of hard rock stuff they have
worked on.

Sorry again for my ignorance . . . I'm just not
very clued in about who everyone keeps talking
about.

Thanks in advance.