`ffplay` can use the concat demuxer similar to `ffmpeg`.

Create a file that lists up the files you want to play:

```
# list.txt
file 'audiofileA.mp3'
file 'audiofileB.mp3'
```

Then run ffplay:
```
ffplay -f concat -i list.txt
```

Other useful options:
* Use `-autoexit` to make it exit when it's done
* Use `-loop 0` to loop forever (press <kbd>q</kbd> to quit).
* Use `-safe 0` if the file paths are absolute (or contain other special characters).

See the ffmpeg wiki about [concat demuxer][concat-docs] for more details.

[concat-docs]: https://trac.ffmpeg.org/wiki/Concatenate