yes, a bit oxymoron title. But here I expect less philosophical talk (well maybe a bit) and more technical. This is just a simple and lazy question from me about tip on playing melody and how to make it sound dissonance. This is also oxymoron because if I randomly play out of tune and recorded it, after 10 times of listening the 'out of tune' will became familiar and I can claim it is new dissonance version... So, what is the theorical (in term of melody counter point) on how to sound dissonance?
Here the simple version of our very familiar tune as starting point:
In terms of periodic tones, sound tones with higher number, more complex interval ratios. The 45/32 tritone is a good dissonance, the 8/7 'minor third' is just that bit more edgier than the 6/5 one. Also, ratios with high prime numbers like 7, 11 and 13 sound quite discomforting to the untrained ear. Remember, tones with partials beating around 10-20 beats per second sound the worst.
Otherwise, simply use actual noise (as in the pitch is indeterminate). Changing between varying degrees/colours of noise in a good rhythmic fashion might give an interesting melody.
Using quartal harmony you can come up with some real dissonant chords, dim7 chords are effective, and flat 9ths are good even though they are less dissonant than minor 2nds also using notes out of the established key can create dissonances.Chromatics and accented unresolved dissonances are effective too.Maybe try messing around with tone rows.
Consonance is created by the fact that every note has many overtones besides the note that's played. When you play a C, other "overtones" are a part of the sound that's going on.
For instance, the main vibration you'll hear is the C, but there are also lesser notes that are vibrating in a more subtle manner with the C.
For instance, when you play a C, the overtones are like this:
C G C E G Bb C D E F ...and so on.
Notice that octaves of C appear the most often, followed by G. G is the second most consonant note besides the octave. If you play a C and a G together, it will sound consonant. Notice that "E" occurs the next most often, which is the major third. And then we have the chord C-E-G if we only use these notes that appear often, which is a consonant triad. The notes that appear most often as harmonics of the note you play will be the notes that sound consonant together. If you want to sound dissonant, you need to use notes together that do not often occurs as harmonics of a given note.