View Full Version : theory-intervals

08-28-2003, 08:59 AM
ok im buffing up on the old theory and im reading this book on well theory. and im on the intervals. sections reading about sharping and dopube sharping, flatting and double flatting perfect and major intervals to make them minor, augmented and diminished. but my question is why are the 1st, 4th,5th and 8th intervals called major and 2nd,3rd,6th and 7th (if they are the right ones and the right way round) called perfect. why call them dofferently? also whats the scale tone formula for a diminished 7th chord/arpegio? is it 1, b3, b5, b7?

08-28-2003, 09:29 AM
Unisons, 4ths, 5ths, and Octaves can be perfect, augmented or diminished... 2nds, 3rds, 6ths, and 7ths can be major, minor, augmented or diminished. This has to do with their positions within scales. They are called differently because they are different. Perfect intervals are very stable. Major and minor are less stable, and augmented and diminished intervals practically beg to be resolved.

1 b3 b5 b7 is a HALF diminished 7 chord

1 b3 b5 bb7 is a FULLY diminished 7 chord

09-04-2005, 05:37 AM
Yeah, ~I'll interval ur face.