Answer :
Cross-sectional studies are the best way to determine the prevalence and are useful at identifying associations that can then be more rigorously studied using a cohort study or randomized controlled study.
A expert orchestra, choir or chamber ensemble (e.g., string quartet or wind quintet) rehearses a piece (or track) a good way to coordinate the rhythmic ensemble, ensure that the intonation of pitches of the exceptional sections fits precisely, and coordinate the dynamics (adjustments in loudness and softness) and phrasing. A professional ensemble will typically best rehearse an orchestral paintings for 2 or three rehearsals that are held numerous days earlier than the first overall performance. A expert ensemble is plenty less probable than an amateur orchestra to play the piece all of the manners through in the first rehearsals.
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