What is the fine-grained topic of the following text: Their first album, produced by the great Dave Hassinger, established them as a force to be reckoned with, and landed them tours with The Doors and Eric Burdon & The Animals, and in time the coveted opening slot on the Woodstock festival (though they ended up going on later thanks to backstage shenanigans). Only return the topic.
The first album of a music band and its impact