Are bass clarinet and tenor sax notations played an octave lower?

Yes, bass clarinet and tenor sax are notated a ninth higher than they sound.

1. Does the tenor sax sound an octave lower than written?
2. Is bass clarinet an octave lower?
3. What octave is bass clarinet?
4. Does the bass clarinet have the same notes as the clarinet?

Does the tenor sax sound an octave lower than written?

The tenor and the alto are the two most commonly used saxophones. The tenor is pitched in the key of B♭ (while the alto is pitched in the key of E♭), and written as a transposing instrument in the treble clef, sounding an octave and a major second lower than the written pitch.

Is bass clarinet an octave lower?

The bass clarinet is a musical instrument of the clarinet family. Like the more common soprano B♭ clarinet, it is usually pitched in B♭ (meaning it is a transposing instrument on which a written C sounds as B♭), but it plays notes an octave below the soprano B♭ clarinet.

What octave is bass clarinet?

The bass clarinet is also considered a low woodwind instrument and uses a much larger reed and requires a much looser embouchure. Many advanced or professional bass clarinets reach down to a low C (sounding B♭, exactly the same as the bassoon's lowest B♭), or two whole octaves below the written middle C.

Does the bass clarinet have the same notes as the clarinet?

The majority of bass clarinet music is written so that the notes a clarinet player sees correspond to the same fingerings they would use on any other clarinet. Meaning, it's written in treble clef but sounds an octave lower (a ninth lower than concert pitch).