A combination includes a plurality of disc assemblies, each having: a disc; a cassette having a window and a sliding element adapted to open and close the window, the disc being disposed in the cassette so as to be accessible by a playback unit of a disc player through the window. The combination further includes a disc player having: a playback unit; a disk magazine including a plurality of disc compartments disposed to form a stack, each of the compartments being adapted to receive a corresponding one of the disc assemblies therein; a transport device travelling toward and away from the stack for transferring a pre-selected disc assembly between a corresponding receiving compartment and the playback unit; and a plurality of cassette holders, each holding a corresponding one of the disc assemblies therein and further being adapted to be gripped by the transport device for being transferred between a receiving compartment and the playback unit. Each of the cassette holders further have: a frame; a catch fixed to the frame for moving the sliding element of the cassette into an open position when the corresponding one of the disc assemblies is inserted into the cassette holder; and an elastic projection distinct from the catch fixed to the frame for moving the sliding element into a closed position when the corresponding one of the disc assemblies is removed from the cassette holder.