Drum Maps allow SONAR users to do many things. A most useful feature is the ability to use a drum map to display each instrument's name in the Piano Roll View. This makes it a lot easier to keep track of instrument locations that deviate from the General MIDI assignments.
Here is a collection of drum maps assembled and edited by SONAR users. They are provided to make editing drum tracks in SONAR easier. The maps are credited to their authors using the screen names from Cakewalk's SONAR users forum.