via TUTORIAL: Playing violin by ear, and Price Tag (Jessie J) – YouTube.

• Easier to learn by ear when listening to same instrument–find a violin instrumental for violin–even better if you can watch a video of violinist as you listen
• 4:31: Try playing the bow in crook of your elbow while fingering the notes–so you can listen to the song as you watch a violinist
• 6:00: Have friend play a note on the piano and see if you can find it on the violin