Bass clef.
bass clef
The Bass Clef is usually the clef used for lower pitched voices.
Treble
The upper is called the "treble" clef; the lower is the "bass" clef.
Sometimes a clef has the number 8 below it, which indicates that the notes are to be played one octave lower than written. It can be used with treble clef for people who are unfamiliar with bass clef, or in bass clef to avoid excess ledger lines.
The piano uses both the Treble clef (for higher pitches) and the Bass clef (for lower pitches). It plays in the key of C. Sometimes it is misinterpreted that the Treble clef is for the rigth hand and the Bass clef if for the left hand. This isn't true. Both hands can use the Treble clef or Bass clef, or even the right hand can use the Bass clef and the left hand can use the Treble clef.
The notes for A major are A B C# D E F# G# A.
Clefs do not have 'sounds'. They are merely tools to indicate where on the musical stave notes are to be placed. However, the treble clef 'places' higher notes than the bass clef. If a clef is placed in the middle of the staff, then the notes that follow that clef are of that clef. For example, if the bass clef is placed on the treble staff, the notes that follow it are to be interpreted as "bass clef" notes and played using lower notes on the piano. The opposite is true if the treble clef is placed on the bass staff.
Lower brass (ie: trombone, tuba, and euphonium), lower strings (ie: cello and bass), and lower woodwinds (ie: bass clarinet and bassoon) Left hand (mostly) piano also uses bass clef
They both play in treble clef. Alto plays in the key of E flat, and tenor plays in the key of B flat.
Double Basses normally play in the Bass Clef. On the other hand, they sometimes use Tenor Clef and I have seen Treble clef used for higher notes but transposed an octave lower than written.