Screen capture

Screenflow would work. But you could also try something like Musicreader.

 

I've used iShowU in the past and have had good luck with it.

 

Both Camtasia and ScreenFlow will do you just fine
Camtasia will allow you to capture specific areas of the screen as I recall
But I don't think ScreenFlow will allow that

 

Screen capture

Camastasia and Screen flow will work I heard but not sure about the usability issue.
I recommend Voila globaldelight.com/voila. Voila can capture audio/video + as optional you can include your own audio (through mic). They also have a trial period for 15 days, try out before you purchase. Also you can annotate images, publish videos to YouTube, Flickr, SFTP, FTP and Trim videos. I use Voila daily. Very helpful.

 

I would look into Boinx Fotomagico. Great for making a slideshow of your images with music. It works on a timeline, just drag and drop in your files. You can set the time of each slide change, use transistions etc. Export to many different types of files at any resolution you need.

 

Or.. you could use a specialized app like MusicReader. There's also one called PDFtoMusic IIRC that will play the score of the PDF file.
I'm sure there are others out there as well.