Hi- I need a suggestion for a microphone for a MacBook Pro. A friend is getting married (her 3rd, only 30 people) - her playlist for songs is on her MacBook so she wants me to use that. I will use audio cable to connect MacBook to tower speaker but am not sure what kind of mic I will need (I am a PC girl). Can I just use the "line in" on speaker and ignore the MacBook? Or should I use one of the fire/thunder/ports on her MacBook. Thanks.