What is the best way to listen to bird songs in the field please?

We would like to be able to listen audibly to bird songs on either an ipod or MP3 player (we possess neither) whilst out bird watching. If a picture of the bird was also available that would be a bonus.  We do not want anything too complicated! Should we get an MP3 player or an ipod and do we have to load everything onto them ourselves? If so what software do you recommend?

Please could you advise. Thank you