Alberti bass意思

"Alberti bass" is a term used in music theory to describe a specific accompaniment pattern that is often used in Baroque music, especially in keyboard music of the 17th and 18th centuries. This pattern is named after the Italian composer and keyboard player Girolamo Frescobaldi's pupil, Girolamo Alberti (1615–1694), who popularized the technique.

The Alberti bass consists of a broken chord played in the left hand, typically in the lower registers of the keyboard. It involves playing the notes of a chord in sequence, one note at a time, usually in the same rhythmic pattern. The most common rhythm is quarter notes, where the thumb plays the first note of the chord, the third finger plays the second note, and the fifth finger plays the third note, all in quarter note values. This pattern can be varied by changing the rhythm or by using different inversions of the chord.

The right hand usually plays the melody or a countermelody above the Alberti bass. This technique can provide a strong foundation for the harmony while allowing the melody to stand out. It is a foundational technique in keyboard playing and is still used in various genres of music today, especially in classical music and popular music where it is often referred to as the "oom-pah" or "walking bass" accompaniment.