Lectia 7
Cum se construiesc acordurile
De obicei nu este nevoie sa sti asemenea lucruri deoarece exista sute de liste de acorduri pe internet. Dar exista momente cand nu ai lista asta in fata, si atunci e bine sa sti si asemenea lucruri.
Pentru inceput trebuie retinut ca o octava are 12 note intre care exista cate un semiton distanta.
Ex: C C# D D# E F F# G G# A A# B (notele notate cu # pot fi scrise si ca bemol de nota urmatoare, ex: C#=Db)
Pentru definirea acordurilor orice octava se defineste ca avand notele la distanta de un semiton intre perechile de note 3 si 4, respectiv 7 si 1 si distanta de un ton intre restul notelor.
Ex: pentru gama C: C D E F G A B
pentru gama E: E F# G# A B C# D#
Nota: Unele acorduri sunt definite ca avand 3 note dar in uzuanta sunt folosite 5-6 note. Acest lucru se datoreaza dublarii anumitor note. Ex: Acordul C major este definit ca avand notele C E G dar se canta pe 5 corzi, candandu-se notele C E G C E. Se observa dublarea notelor C si E.
Alcatuirea acordurilor:
Se considera gama generala: R1 R1# R2 R2# R3 R4 R4# R5 R5# R6 R6# R7 cu forma redusa
R1 R2 R3 R4 R5 R6 R7
1 2 3 4 5 6 7
Se condidera gama particulara C: C C# D D# E F F# G G# A A# B cu forma redusa
C D E F G A B
1 2 3 4 5 6 7
Pentru acorduri se ia varianta restransa, fiecare nota fiind notata de la 1 la 7. Orice acord se exprima prin considerarea notei radacina ca fiind notata cu 1 iar celalalte note pe pozitiile urmatoare.
| Tip | Formula | Form gen | Exemplu | Notatie indici |
|---|---|---|---|---|
| major | 1 3 5 | R R3 R5 | C: C E G | nici unu,maj,M |
| minor | 1-3b-5 | R R3b R5 | Cm: C D# G | m |
| augmented | 1-3-5# | R R3 R5# | Caug: C E G# | +,aug |
| suspended fourth | 1-4-5 | R R4 R5 | Csus4: C F G | sus4 |
| added ninth | 1-3-5-9 | R R3 R5 R9 | Cadd9: C E G D | add9 |
| minor added ninth | 1-3b-5-9 | R R3b R5 R9 | Cm(add9): C Eb G D | m(add9) |
| fifth | 1-5 | R R5 | C5: C G | 5 |
| sixth | 1-3-5-6 | R R3 R5 R6 | C6: C E G A | 6 |
| minor sixth | 1-3b-5-6 | R R3b R5 R6 | C6: C Eb G A | m6 |
| sixth, added ninth | 1-3-5-6-9 | R R3 R5 R6 R9 | C6/9: C E G A D | 6/9 |
| minor sixth, added ninth | 1-3b-5-6-9 | R R3b R5 R6 R9 | Cm6/9: C Eb G A D | m6/9 |
| seventh | 1-3-5-7b | R R3 R5 R7b | C7: C E G Bb | 7 |
| diminished seventh | 1-3b-5b-7bb | R R3b R5b R6 | Cdim7: C Eb Gb A | dim7 |
| seventh suspended fourth | 1-4-5-7b | R R4 R5 R7b | C7sus4: C F G Bb | 7sus4 |
| major seventh | 1-3-5-7 | R R4 R5 R7 | Cmaj7: C E G B | maj7 |
| minor seventh | 1-3b-5-7b | R R3b R5 R7b | Cm7: C Eb G Bb | m7 |
| minor,major seventh | 1-3b-5-7 | R R3b R5 R7 | Cm(maj7): C Eb G B | m(maj7) |
| major seventh, flat fifth | 1-3-5b-7 | R R3 R5b R7 | Cmaj7(b5): C E Gb B | maj7(b5) |
| minor seventh, flat fifth | 1-3b-5b-7b | R R3b R5b R7b | Cm7(b5): C Eb Gb Bb | m7(b5) |
| augmented seventh | 1-3-5#-7b | R R3 R5b R7b | Caug: C E G# Bb | +7,aug7 |
| seventh, flat fifth | 1-3-5b-7b | R R3 R5b R7b | C7(b5): C E Gb Bb | 7(b5) |
| seventh, flat ninth | 1-3-5-7b-9b | R R3 R5 R7b R9b | C7(b9): C E G Bb Db | 7(b9) |
| seventh, sharp ninth | 1-3-5-7b-9# | R R3 R5 R7b R9# | C7(#9): C E G Bb D# | 7(#9) |
| augemented seventh, flat ninth | 1-3-5#-7b-9b | R R3 R5# R7b R9b | C+7(b9): C E G# Bb Db | +7(b9),aug7(b9) |
| ninth | 1-3-5-7b-9 | R R3 R5 R7b R9 | C9: C E G Bb D | 9 |
| major ninth | 1-3-5-7-9 | R R3 R5 R7 R9 | Cmaj9: C E G B D | maj9 |
| minor ninth | 1-3b-5-7b-9 | R R3b R5 R7 R9 | Cm9: C Eb G Bb D | m9 |
| eleventh | 1-3-5-7b-9-11 | R R3 R5 R7 R9 R11 | C11: C E G Bb D F | 11 |
| minor eleventh | 1-3b-5-7b-9-11 | R R3b R5 R7 R9 R11 | Cm11: C Eb G Bb D F | m11 |
| thirteenth | 1-3-5-7b-9-11-13 | R R3 R5 R7 R9 R11 R13 | C13: C E G Bb D F A | 13 |
In cazul in care sunt prea multe note pentru ca sa poata fi cantat la chitara, din acord se pot omite anumite note. Cel mai des se omit nota radacina sau nota a V-a.

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