Mozart Sonata in A Major K 331

[arch95]

Hello,

I have a question about Mozart Sonata in A Major K 331 1st Movement 5th Variation. Specifically, measure 100: [/URL][/img]
I have the hang of the rest of the sonata, just not this measure. I have been using the metronome to practice this section as well as practicing very slowly, but I can't seem to get the hang of this one measure. Any tips on how to practice this would be greatly appreciated! Thank you!

[arch95]

This is a picture of the measure from my score.

[j_menz]

What's giving you trouble? The speed of the scale or the triplet polyrhythm?

[arch95]

I'm having difficulty mostly with the polyrhythm.

[j_menz]

Is this the first time you've come across 2v3 polyrhythms?

If so, you might gain some advantage by taking a side route and practice them specifically.

A search of the forum will give you some good tips, but Debussy's first Arabesque is an excellent (and musically nice) exercise that will help give you the hang of them.

[arch95]

I have played polyrhythms in the past, but for some reason this one in particular is giving me trouble..I'm not sure why. Do you think it would be better to practice without the metronome?

[j_menz]

Do you think it would be better to practice without the metronome?

My answer to that question is always yes.

You should use the alberti bass to give yourself an even beat and that needs to be established first.

 Once you have that, it's a normal 2v3, though the first note of the triplet forms part of the earlier phrase and the last two are staccato.  If that's the cause of the problem, start by ignoring that and play the whole thing as if it were the same phrase. Once you've got the timing solid, you can add in the phrasing/staccato.