Two questions:Ringtones and External Displays

[calviin]

1. Can I take a song on iTunes and then cut it to 30 secs or so and then send it via bluetooth to my phone? If so, how?
2. How can I use my macbook in clamshell mode?
Thanks everyone!

 

[kastenbrust]

1) Audacity

2) Here

 

[calviin]

How exactly do I use audacity?