Stringed Instrument Tunings - R

Instrument	Strings & Courses	Tuning(s)	Alternative Names	Origin	Notes
Rajao	6 strings 5 courses	D4•G4•C4•E4•A4 (A4)	Rajão	Portugal	Sometimes the top course is not doubled, so there are only 5 strings
Ramkie	4 strings 4 courses	C3 F3 A3 C4	Afri-can, Kitaar	South Africa	Typically these are homemade, and therefore quite variable.
Rebab	2 strings 2 courses	D3 A3		Java	Tuning given is approximate: does not follow western equal temperament
Requinto	6 strings 6 courses	A2 D3 G3 C4 E4 A4	Requinto guitar	Mexico	4th above the standard guitar
Ronroco	10 strings 5 courses	Argentine (G6/Em7): D3 D3•G4 G4•B2 B3•E4 E4•B4 B4 Argentine Variant: C3 C3•F4 F4•A2 A3•D4 D4•A4 A4 Bolivian (C6/Am7): G3 G3•C4 C4•E4 E3•A3 A3•E4 E4	Ronrroco	Andean Region	In effect, a baritone charango. Bolivian tuning is one octave below the charango. Either tuning may be considered "standard".
Ruan	4 strings 4 courses	G2 D3 G3 D4	Ruanqin	China
Russian guitar	7 strings 7 courses	Standard/Common: D2 G2 B2 D3 G3 B3 D4 Alternate: Gypsy: D2 G2 B2 G3 D3 C3 D4	semistrunnaya gitara, semistrunka	Russia	There are many variant tunings, mostly idiosyncratic to individual perfomers.