And so I put the CD into my Hi-Fi, one of those really old fashioned CD players, long before the days of Spotify and things like that where you could just Search for your band and listen to them.
To " hook something up" means to connect two things together, usually electronic things: " I hooked up my DVD player to my television" – I connected it so I could watch a DVD movie.
Everybody Loves Raymond, the complete series on DVD with a DVD player and backup generator to power the DVD player so we can watch Raymond in case we lose electricity.
It was a small rectangular object made of plastic which contained a length of tape which, when played through a device called a cassette player, produced sound.