Sing free/What you need
Test your equipment
edit- Establish that your computer can play this file:
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D E F# G A B
D major
E
editonlinemictest.com/tuners/pitch-detector
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A major
onlinemictest.com/tuners/pitch-detector
D E F# G A B
D major
onlinemictest.com/tuners/pitch-detector
A B C# D E F#
A major