Music is a sequence of notes in some well defined (or may be random) order. Finding Frequencies of notes in piano/keyboard The notes in the previous lower octave are depicted in lowercase letters with a '.' under the note. The notes in the next higher octave are depicted as C, D, E, F, G, A, B (in uppercase letters). When providing songs in western notes, the current octave is specified as c, d, e, f, g, a, b (in lowercase letters). You can call it either way whichever is convenient to you (somebody's SHARP or somebodyelse's FLAT). Basically, the point to understand is that C # and Db both point to the same key on the keyboard (its the black key between C and D). The explanation is the same as the sharp, the flat key is the immediate left black key for the corresponding white key with which they are associated with. That same black key (C #) can also be called as 'Db' (pronounced as D- FLAT). Thats why its called C # (pronounced as C- SHARP). For example, looking at the above picture, the 'C #' is the immediate (note: only adjacent) black key to 'C'. A black note immediately to the right of the white key is considered a sharp note for the corresponding white key. Now the black keys are specified by either a ' #' (pronounced as SHARP) or a ' b' (pronounced as FLAT). We have the basic notes C, D, E, F, G, A, B (like the s,r,g,m,p,d,n) but these are all the white keys. Note that the western notations have almost the same pattern as the carnatic swaras. Figure 2: Keyboard mappings in western notation
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