What is the fine-grained topic of the following text: That adventurous attitude of “hey, this could be fun” led to the ’72 album Procol Harum Live: In Concert with the Edmonton Symphony Orchestra – a significant milestone in Procol Harum’s career, and a huge influence on the city where it was recorded. Only return the topic.
Procol Harum's 1972 album "Live: In Concert with the Edmonton Symphony Orchestra"