Midimizer lets you shuffle and repeat your MIDI files and construct as large a playlist as you wish.
You can collapse the window to just show the song, playback controls and song pop-up menu. The shuffle feature lets you randomize the order in which MIDIs are played.
Midimizer has a friendly, intuitive, self-explanatory interface. Interactive "hints" tell you what each icon represents and balloon help offers detailed explanations of each button. MIDIs continue to play even while holding down the mouse or viewing menus, unlike some utilities such as MoviePlayer.
It includes full Mac OS 8.5 support.