Focus are a classic prog band from the Netherlands. Focus 3 is (obviously) their third album and was released in 1972. Similar Jethro Tull (probably my least favorite prog band), Focus has a pretty amazing Flautist. Be sure to check out the amazing flute solo from Hocus Pocus at the bottom.
If you were to know Focus at all, it might be because of their more popular “Hocus Pocus”.