D to Db is a half step. Look at the keys B and C on the keyboard, there is no key in between them which means it is a half step. A whole step is two keys up (either black or white) therefore, D to Db would be a half step.
String, also known as a Guhzeng, the instrument is plucked and strings are stretched to acheive different pitch.
I can see you okay do you see me yes or no?
Its the chords and kind of the vibe the song gives. basically chord progression that has a pleasing effect.
Answer:
San Vitale in Ravenna: Justinian's Little Gem
Explanation: