Answer:
2
There are a lot of good answers already, so I'll just add one thing. A song you hear on a recording may not even be performed in the key you hear on the recording. Post-production, especially in certain styles, will sometimes raise the pitch a little to increase energy both by raising the tempo and through the implication of a higher tessitura requiring more energy. This does not happen so much in reputable classical recordings, but I understand it is very common in some pop styles
Explanation:
Base on my research
