*You are a composer who just wrote an awesome piece of music. Now it's time to present it to a band that will perform your piece, but there's a problem! The singers vocal range doesn't stretch as your piece requires, and you have to transpose the whole piece.*
# Your task
Given a list of notes (represented as strings) and an interval, output a list of transposed notes in *sharp* notation.
**Input notes may be represented both in flat and sharp notations (more on that below).**
**For this kata, assume that input is always valid and the song is *at least* 1 note long.**
**Assume that interval is an integer between -12 and 12.**
# Short intro to musical notation
Transposing a single note means shifting its value by a certain interval.
The notes are as following:
    A, A#, B, C, C#, D, D#, E, F, F#, G, G#.
This is using *sharp* notation, where '#' after a note means that it is one step higher than the note. So A# is one step higher than A.
An alternative to sharp notation is the *flat* notation:
    A, Bb, B, C, Db, D, Eb, E, F, Gb, G, Ab.
The 'b' after a note means that it is one step lower than the note.
# Examples
    ['G'] -> 5 steps -> ['C']
    ['Db'] -> -4 steps -> ['A#']
    ['E', 'F'] -> 1 step -> ['F', 'F#']
def transpose(song, interval):
    notes = ["A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#",
             "A", "Bb", "B", "C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab"]
    return [ notes[(12+notes.index(n)+interval)%12] for n in song ]
def transpose(song, interval):
    notes = ["A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#",
             "A", "Bb", "B", "C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab"]
    return [ notes[(12+notes.index(n)+interval)%12] for n in song ]