• First you have to find the time signature.
Therefore you better skip the intro or the beginning. It is more clear in the middle of the piece.
First you search for the first beat. That is the strongest one:

So, 4 even beats.
The 4 beats can be 4/4 or 12/8
With 4/4 the counts (beats) are divided into two 8ths. With 12/8 the counts are divided into three 8ths.
It is 4/4.

• Next: which tonality? In fact the question is: which notes are used, which aren't? Turn on the music and hit the notes of the piano:
You can hear which notes are wrong, which aren't: all white keys are right, except the f:

It's a nice experience: I don't know where exactly the f# is used, but I can hear that it is there somewhere.
So: e f# g a b c d e is the used scale, the tonality.

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