Standard cassettes , but playback only in that machine as its 4 parralell tracks on one side only.
stereo music cassettes use every other [1&3] track one way and the other 2 on the reverse direction.
unless there is a built in mic,on the machine, (unwieldy to play into the tabletop that the machine is setting on) either a pickup or a mic, mic stand cable etc. is needed as a signal source.
plug and play kits are available with the whole assortment combined.
writing about music
is like dancing,