How do you know which key your alto sax is in?

The Alto Saxophone is in Eb When you play an F# on the Alto Sax it will sound as an A on the Piano Response to previous answer: No, most are Eb. There are different companies that make a Bb (not a tenor or soprano) If you play a written C on the sax, it will sound as an Eb on a piano A tuner would be helpful to find out what concert pitch you have. Play a C on an alto into the tuner.

The pitch that shows up on the screen of the tuner is the pitch of your instrument I believe.

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