to come back to guitarrista's results with the online tap metronome. I doubt that this measures are right.
It is very easy to meter the average speed. Only what you have to do is to measure the total time and then you can calculate it.
For example: the first part of RdlA consists of 20 bars / 3/4. Starting from the tempo for pami, you play it 6 times per bar. So, it is easy: 20 bars multiplied by 6 = 120. Consequently you play it with the speed of 120 bpm, if you need one minute for the first part of the piece.
For example, to calculate s.o. plays RdlA / first part in 40 seconds you have to use the rule of three: (anti proportional)
60 sec = 120 bpm
40 sec = ?
60 x 120 = 7200
7200 / devided by 40 = 180bpm
So, I did that to several players on yt and I come to other results than gutiarista. Perhaps, somebody plays it one time faster and one time slower - but in all cases I came to slower results. For instance Edson Lopez with 52 seconds for the first part = 138 bpm, or David Russell in 49 sec (first part) = 147 bpm.
By the way, I find that the measure in figures is not so important. Some players performe it relative slowly, but it touches my soul and it sounds beautifully! And some players who play it faster, are touching my soul too. (if you remember RdlA of "owl" it was so slow but so beautiful!)
And others, in spite of their tempo, can't convince me!
Much more important than speed in figures is the interpretation, and what the audience (and the performer
) are feeling. And, last but not least: if someone plays it slower, it has to be much more exactly tremolo, to create the right effect. A very fast tremolo conceals the impurities. You can easily try it out with a music editing programm.