major and minor keys的意思|示意

To find out, Bowling and his colleagues first measured the distribution of tones in around 7500 western classical melodies and Finnish folk tunes in both major and minor keys.

为了证明这一点，丹尼尔●保林和他的同事们首先测量了大约有7500首西方经典歌曲和芬兰民歌声调的分布情况，它们中有的属于大音阶，有的属于小音阶。

Why do tunes in a major key, such as Singin' in the Rain, sound cheerful, while those in minor keys – Pink Floyd's Another Brick in the Wall, say – sound gloomy and depressing?

为什么大音阶的曲调，如《万花嬉春》（又名《雨中曲》）的声音显得非常轻松愉快，而小音阶的乐曲，譬如像《墙上的另一块砖》听起来却十分悲观沉闷?。