Recorder

The recorder is a woodwind musical instrument of the family know as fipple flutes or internal duct flutes -whistle-like instruments which include the tin whistle. The recorder is end-blown  and the mouth of the instrument is constricted by a wooden plug, known as a block or fipple.

Today, it is often thought of as a child's instrument, but there are many professional players who demonstrate the instrument's full solo range. The sound of the recorder is remarkably clear and sweet, partly because of the lack of upper harmonics and predominance of odd harmonics in the sound.

Percussion Instruments

A percussion instrument is any object which produces a sound when hit with an implement or when it is shaken, rubbed, scraped, or other wise acted upon in a way that sets the object into vibration. The term usually applies to an object used in a rhythmic context or with musical intent.

In primary school, there are various types of percussion instruments.

(a) Tambourine 铃鼓	(b) Triangle 三角铁
(c) Castanet 指响板	(d) Tone block 双响筒
(e) Ring bell 手铃

Definition of Music

Music is an art form whose medium is sound and silence. Common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics, and the sonic qualities of timbre and texture.

The creation, performance, significance, and even the definition of music vary according to culture and social context. Music ranges from  strictly organized compositions (and their recreation in performance), through improvisational music aleatoric forms. Music can be divided into genres and subgenres, although the diving lines and relationships between music genres are often subtle, sometimes open to individual interpretation, and occasionally controversial. Within "the arts", music may be classified as performing art, a fine art, and auditory art. There is also a strong connection between music and mathematics.