A ukulele is tuned like the thin 4 strings of a standard guitar. The baritone Uke uses G" Tuning (D G B E) just like the guitar. The Soprano, Concert and Tenor uses "C" Tuning G C E A and "D" tuning (A D F# B). The Tenor can also be tuned like the Baritone ukulele. These are the same intervals as the guitar's upper 4 strings, string 4 to 3 is a perfect fourth (P4) or 11th depending on whether using traditional high tuning or a more guitar like low tuning, string 3 to 2 is a major third (M3) and string 2 to 1 is a perfect fourth (P4)."