Assuming it's not a mutated "four", we sing the monosyllable "flat". At the beginning stage though I encouraged the use of "weird" for all accidentals. Ciphers are easy to remember as homework, but comparing two choirs I've led, a little time to learn solfege syllables ultimately makes up for itself in the time saved reminding "not svvnn, seh!"What's the number for flat-seven?
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