I have been listening recently with a score in hand. I came across an old opera that came with a score and really liked listening to it with it. It's a different experience as you become more myopic with every note sung. I find myself being absorbed in technical aspect of singing. It's probably not something you do with a brand new opera as you lose sight of the whole but it's a way to get deeper into music you already are familiar with.
It would be like
this on youtube.
You can get a lot of free scores from
here.
What do you think?