Oh boy! You missed trick there! You should have written "my name is Bond, Charles Bond... "
You have me TOTALLY confused Charley and you seem to be running at the speed of light.
So, you have 20 songs, in what format? Each as a complete mix on a CD? If you want to 'modify' the songs in any way, change loudness, change tonal qualities you need something to play them into a computer, an Audio Interface and since it seems you are just dealing with stereo tracks a basic 2 in 2 out AI will serve. Yes that can feed the Sony receiver and you can listen to the results on the speakers...which are what? Not many 'rockyrolly' high power speakers are a lot of good for music monitoring.
On the computer you will need some software. The "DAW" and with that you will have access to $1000s worth of software versions of excellent 'outboard' gear such as EQ (tone) compression/limiters and other tricks. Reaper might even have a Karaoke generator in it?
Dave.