Lymphatic tissue is rich in lymphocytes (and accessory cells such as macrophages and reticular cells). The lymphatic tissue includes the lymph nodes, spleen, tonsils, adenoids and the thymus (an organ in the chest that is particularly large during infancy).
The term musical form (or musical architecture) refers to the overall structure or plan of a piece of music; it describes the layout of a composition as divided into sections. In the tenth edition of The Oxford Companion to Music, Percy Scholes defines musical form as a series of strategies designed to find a successful mean between the opposite extremes of unrelieved repetition and unrelieved alteration.
Melody, in music, the aesthetic product of a given succession of pitches in musical time, implying rhythmically ordered movement from pitch to pitch. Melody in Western music by the late 19th century was considered to be the surface of a group of harmonies.