Burning downloaded music to cr-r but discs dont play

hello

We have an iMac with OSx 10.6.8.

We have been burning music downloaded through soulseek to disc to play in a cd player. It all seemed to be going ok- but for some reason even a disc that previously played in our Bose wave music system cd will not now play ( in fact its messed up the Bose which wont play any music cd now).

We have been trying to sort out what has gone wrong and have read various online forums where commentators have noted that you need to make sure that iTunes is set to audio cd, etcetc. We have not used iTunes to burn- we have downloaded music through soulseek into a document folder and have burned to disc from there. Cant find anything there to set for audio cds- it just seems to do it automatically.

We're not sure what we have done wrong.

Not sure how to redo all this from iTunes as we are beginners to all this. Idiots even....

Can anyone explain in words of one syllable how to sort this out?

Many thanks

Rarmy.