If we take seven consecutive ones, we get the major diatonic scale which, in C, is the white notes on the piano.
From the scienceblogs.com
The Paraguayan harp is a simplified variation of the instrument, with 38 strings tuned to one major diatonic scale.
From the en.wikipedia.org
The diatonic harmonization of any major scale results in three major triads.
From the en.wikipedia.org
Some writers use upper-case Roman numerals to indicate the chord is diatonic in the major scale, and lower-case Roman numerals to indicate that the chord is diatonic in the minor scale.
From the en.wikipedia.org
In the modern western conception, a mode encompasses the same set of diatonic intervals as the major scale.
From the en.wikipedia.org
The most familiar of these are the two diatonic scales of seven notes each, called the major scale and the minor scale.
From the en.wikipedia.org
Because the Cajun accordion is a diatonic instrument, i.e., do-re-mi or natural major scale, it can only play tunes in a few keys.