javax.sound.midi
Interfaces 
ControllerEventListener
MetaEventListener
MidiChannel
MidiDevice
Receiver
Sequencer
Soundbank
Synthesizer
Transmitter
Classes 
Instrument
MetaMessage
MidiDevice.Info
MidiEvent
MidiFileFormat
MidiMessage
MidiSystem
Patch
Sequence
Sequencer.SyncMode
ShortMessage
SoundbankResource
SysexMessage
Track
VoiceStatus
Exceptions 
InvalidMidiDataException
MidiUnavailableException