All EZkeys sound libraries contain the EZkeys player.
In addition, all EZkeys sound libraries contain the same base MIDI library. It will work 'ok' with the Mellotoon library. Not 'great' as some of the Mellotoon sounds are legato type sounds (string, choir, et al). I would also recommend the Keys and Strings MIDI pack unless you plan on playing in your own parts via MIDI device.
http://www.toontrack.com/produ.....keys-midi/