Can someone help me choosing children's songs?

I am a scout leader for 6-8 year olds and they are having a large teddy bears picnic tomorrow night. I have been left in charge of getting music for them, but it's proved more difficult than I thought! Does anyone know what kind of songs would be suitable for that age group? I need an answer urgently!!! I can't have them too babyish that they would get annoyed, but they need to be children's songs! Thank you! (Also, if anyone knows a link where I could download the Teddy Bear's Picnic song, could somebody post it to me? I have the Anne Murray version but I don't think they'll like it!)