The turns that climb
The theme opens with a little turn around A, apOp, and lands on C (s). The same shape is then played a step higher around C (dsas, landing on E) and around E (gfDf), and then twice around A an octave up, kjHjkjHj, landing on C6 (l). Each turn is four quick notes, written joined; the dashes after s, f and l are the short silence that follows each landing.
Three of the turns contain a black key just below the note they circle: O (G♯4), D (D♯5) and H (G♯5), all with Shift. Keep the Shift finger ready: in each of those turns the black key is the third of the four notes.
The second line in thirds
After the high C the melody comes down in single notes, j l k, and then the right hand plays thirds: [Gj] (F♯5 and A5), [fh] (E5 and G5), with a single B5 (k) between the groups. The phrase closes on [DG], D♯5 and F♯5, and a held E5. A third is two keys at once, so on a computer keyboard press Shift with both letters of [Gj] or [DG]; for [fh] no Shift is needed.
Getting the speed
The Rondo alla Turca is quick, but the letters are not hard once the turns are in the fingers. Practise each turn slowly until the four notes are even, then link them. Play it for me at Slow is a good first listen: the runs are easier to follow at half speed. Mozart also writes a quick grace-note flourish before each single B in the second line; the sheet leaves those out.
About the piece
The Rondo alla Turca is the third and last movement of Mozart’s Piano Sonata No. 11 in A major, K. 331. IMSLP dates the sonata to about 1783 and lists its first edition as Vienna, Artaria, around 1784. Its three movements are a theme with variations, a minuet, and this rondo “in the Turkish style”, which opens in A minor. Written well over two centuries ago, the music is free to play.
Another opening in A minor, with both hands, is Für Elise.