picking the correct key

[maxym.srpl]

I’ve noticed that some songs are written in C major, others in A♯/B♭ major, D major, E major, etc. What factors influence an artist’s or composer’s choice of key?

Watching videos, the same producer changes the key from song to song.

Let’s stick to electronic instrumental music, to avoid singer voice range issues.

With regards

[Benedict]

There is no such thing as "correct" or "more betterer" Key/Scales. Nor do Scales have a vibe per se. Ok, so an Arabian Scale will feel Egyptian more than say C Maj but that is cultural, not factual as such.

So the thing is that the composer picks a Key/Scale that suits what they are doing for one of many reasons which can range from 'C Maj is easy' to 'wanting a specific turn of phrase' that requires B Min Aug to comfortably allow that sequence of notes.

Further, you can (and should) create your own Scales for pieces. The thing about Scales is they only exist to help other musicians muck in with you as y'all pick away on yer banjos and fiddles. So if you want to make a piece with C, C# and A, you may do this. The only proviso being that you can have the relevant audience understand what you are doing - not the scale but the Story being told. You do this by helping the listener understand the context and by being consistent. Show your pattern a few times and people (who want to) will follow. People with no sense of tune are inconsistent, which is what makes them a pain to listen to (and a great joke on Idol shows).