An online trombone that sounds like one
Most online instruments are a synthesiser with a picture on top. This one plays recordings of a real trombone, so the attack, the tone and the decay are the instrument's own. The trombone is the only brass instrument that can glide continuously from one note to another.
A short history of the trombone
The trombone has barely changed since the 15th century, when it was called the sackbut. Beethoven brought it into the symphony in the finale of his Fifth.
From the keyboard to the real instrument
A real trombone is written in bass clef (tenor clef up high). The keyboard here plays the sounding notes, so a melody you find by ear is the melody you hear. To go further, the free sheet music and chord pages work with any instrument you can read music on.