Apple Logic Pro /LogicExpress Discussion

I\ufffdm on holiday reading the Logic tutorial, which is excellent, and I am 
learning a lot from it. Can recommend it to any other novices, its worth 
every penny. 

One subject that\ufffds not explained is when to choose mono and when stereo when 
recording. For instance, I haven\ufffdt a clue whether it would be better to 
record piano, vocals or bass in mono. I have always chosen stereo. Could 
someone explain when it would be benefical to chose mono? 

Thanks in advance. 

Andy B