Perfect fifth because you are going from do to so which is 5 steps apart :) so do to ti would be a perfect seventh since theyre seven steps apart. a perfect octave would be do to do.
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20th-century classical music describes art music that was written nominally from 1901 to 2000, inclusive. Musical style diverged during the 20th century as it never had previously. Neoclassicism and expressionism came mostly after 1900. In the early part of the 20th century, many composers wrote music
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