i want to say '' the concert was cancelled because the lead-singer of the band was sick''. should I say:

cuireadh an ceolchoirm ar ceal de bharr tinneas an phríomh-amhránaí/ mar bhí sé tinn/ or which other form? SEE title please.
Please also correct any séimhiú etc errors and Tuiseal Ginideach. thanks

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{Is geal leis an bhfiach dubh a ghearrcach féin}

toisc an príomh-amhránaí ' bheith breóite (or "teinn", which is understood in some parts as "sore")