Re: Which note can I remove in a 7th chord?
You can always omit the 5th on any chord! Unless the chord has an altered 5th as in C7+ and C7b5 the the fifth is not harmonically important. Even under those circumstances other instruments may be playing the fifth so nobody will miss it if you omit it.
Keep in mind that the fifth if heard by the listener even when its not played because of the overtone series when maj & min triad based harmonies are being used. If you play C E C or C E B on the piano and listen really closely you would swear that you could hear the G!
yup, what this guy said. I'd tend to drop the root 1st (as long as the bass covers it) & just play the new major or minor triad (3 note chord).. for example, if your chord is a C Maj7, those notes are C, E, G, B ... now if you take a look at those notes starting from E, you have an E Minor Chord (E,G,B). So have a bass player (or another inst) play the C & you play an E minor chord & it adds up to a nice C Major 7th without sounding too flatulent.
Want a D minor 7th? (D, F, A, C) have the bass play the D & you play an F major chord (F, A, C)..
This same little trick can apply to 9th, 11th & 13th chords too (I.E. ... a C major 9 is C, E, G, B, D --- so drop the C & E, have the bass play the root (C) & you play a G major chord (G, B, D) got rid of the root AND the 5th & you play a normal non-flatulent triad & come out sounding like a star... for 11th's & 13ths, just keep on in the same fashion.
But like the guy I quoted said tho'.. watchout for those chords with altered 5ths. Although, a chord such as B Min7b5 can still use this method (B, D, F, A) drop the root & what do you have? D minor chord.
happy arranging : party: