This is a Sony TC-630 reel to reel tape player. I had one of them back in the mid '70s. I bought it so that I could record a two man group that my buddy and I had. He played a 12 string guitar and I played a harmonica and the drums, (not at the same time... I wasn't that coordinated.) For those of you who might have had one of these wonderful machines you'll remember that it had what Sony called "Sound on Sound" capabilities. Simply put, that meant that after you had made a recording you could go back to whatever point you wanted to and record something else on top of what you had just recorded, without erasing your original recording. What I would do is record my friend and I playing a song, with me on my harmonica, usually playing something by John Denver. When we were through I would go back to the beginning of the song and using headphones, listen to what we had just recorded while playing my drums using the Sound on Sound function. When we would play back the recording it would play everything just as if we had three members in the group! What a great machine this was! It weighed about a zillion pounds, though.