My grandson very much enjoys the Chirp app for the iPhone and iPod Touch. Using it, one can learn about the bird songs of a great number of birds you're likely to find in your country. The app allows you to play song samples for each bird or you can take a series of graded quizzes to test how well you know the bird songs. My grandson is better at it than me! I can recommend this if you enjoy birds. The app was just £1.99 in the UK and well worth it.