Final answer:
A Major 6th (M6) above an E-flat is the note C. The specific octave of the C will depend on the octave of the E-flat that is being referenced.
Step-by-step explanation:
When determining what pitch is a Major 6th (M6) above an E-flat, we need to count up the musical scale from E-flat. A Major 6th above E-flat is the note C. If E-flat is assumed to be E-flat4 (the E-flat above middle C), then the Major 6th above would be C5. However, if no octave is specified, we are simply identifying the note name and not the specific octave in which it sounds.