You might, say, play the scales, the major and minor scales, to help you with your musical ability or your musical proficiency – your ability to play the piano.

你可以，比如说，演奏音阶，大调和小调，来帮助你提高你的音乐能力或你的音乐熟练程度——你弹钢琴的能力。

When I play I always try to think about the strings behind the keys. You can play a scale like this. Which I think is great, but I can also play it like this.

当我演奏时， 我总是想着琴键后面的琴弦。 你可以像这样弹奏音阶。我认为这很棒， 但我也可以这样玩。