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#5: In Biab the notes that are played when I enter C7alt are: C E G Bb and Db. Strange though that C and Db don't seem to clash, while they only have a half tone interval.
Superbron


That's a bit odd, with the G, but it's possible, especially if you look at the chords before and after, or if it's a passing tone.

About the dissonance of two tones a half-step apart, you are already used to a more melodious example, the Maj7 chord. CMaj7 has both a C and a B natural, and they sound fine together, even next to each other. For example, try voicing it on a piano like this, going up: B, C, E, G. It should sound fine, partially because we are used to that sound in Western music. Contemporary jazz players have similarly become used to the sound of altered chords, and find no dissonance. Plus, it's a whole lot of fun to play over because there are so many things you can play on it.

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