What is a 10th interval in music?
In music and music theory, a tenth is the note ten scale degrees from the root of a chord and also the interval between the root and the tenth. Since there are only seven degrees in a diatonic scale the tenth degree is the same as the mediant and the interval of a tenth is a compound third.
What are 10th chords?
A tenth is just a fancy way of saying a third, used when the notes are an octave farther apart than normal. Try counting up from the root C to find the diatonic 10th: C-D-E-F-G-A-B-C-D-E. Notice that going from C to the high E is a distance of 10 (counting the first C as 1, since there's no such thing as a 0th).