MIDI Sequencing is considered an art in itself by some.
Here at Barclasion Music MIDI Sequencing can be and is done often on most projects.
Examples may be that you want a horn section or an orchestra but can't afford the expense of that many musicians, then with the use of synthesizers, samplers and multi tracking, those type of parts can be realized and quite convincingly too.
Another example may be that you are needing a dance type track with techno type sounds pulsating throughout.
Through the use of MIDI Sequencing, this sound and feel can be accomplished.