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Some modern composers (including Francis Poulenc , Krzysztof Penderecki , and Luigi Nono ) have expanded the symbol's usage to indicate approximate duration, incorporating fermatas of different sizes, square- and triangle-shaped fermatas, and so on to indicate holds of different lengths. However, that is not standard usage. In the music notation program, Sibelius , "By default, a regular fermata is set to times written duration, a long (square) fermata is set to times written duration, and a short (triangular) fermata is set to written duration."  Thus a whole note with fermata would last 4+2=6 quarter notes, 4+3=7 quarter notes, or 4+1=5 quarter notes, respectively.