AKoff Music Composer 

Recognizes polyphonic music from microphone (other Wave input or file) and converts it into Midi sequences. You can sing, whistle or play guitar, piano and so on with your microphone, Composer will automatically recognize and score your music.
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n-Track Studio 

Multitrack recording and editing software with support for realtime effects through DirectX plug-ins (Reverb, Compression, Chorus, Delay, Pitch Shift, Graphic and Parametric EQ effects are included), audio and MIDI tracks, 24 bit soundcards and more
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ArtWonk 

ArtWonk is an interactive program for creating MIDI music and graphics algorithmically. Not a set of canned me-too riffs or rules, but an open ended palette of composing modules to powerfully boost your creativity.
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Sweet Sixteen MIDI Sequencer 

A comprehensive and powerful MIDI sequencer. Sweet Sixteen offers Piano Roll, List and Transform edit pages as well as a dedicated Mixer page you can use for your favorite synthesizer.
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gmorgan 

MIDI rhythm station emulator software. a modern organ for play in real time or sequence, full midi configurable, can export live or sequence performances to MIDI file format. Maintain 500 patterns, 100 Styles, 100 Sound Combiantion in memory.
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Music MasterWorks 

MIDI music composing software. Allows you to compose music just by singing into your PC microphone. It will also analyze your singing. You can record, edit, playback and print sheet music as well. Compose in either staff or piano roll notation.
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