i may be able to help but id need to find a way to like- talk talk to you so i can get more information, this is a familiar anime but id need a weeeeee bit more info
Answer:
Determine size (by counting lines and spaces between the notes)
Determine if the top note is in the major scale of the bottom note.
If it is: the interval is perfect (if it is a unison, fourth, fifth, or octave) or it is major (if it is a second, third, sixth, or seventh)
Homophonic texture occurs when there is a melody accompanying with chords like in a guitar. In Baroque period, there was homophonic music as there was one melody with a support from a keyboard player thus one person singing happy birthday with a simple chord with melody has a homophonic texture.