I don't really have a send off tune unless you want Khe Sanh - Cold Chisel but that doesn't quite fit the whole deep space thing.
I do however have the perfect songs to listen to while traveling there
[video=youtube;Y7Ux7gp1mYs]https://www.youtube.com/watch?v=Y7Ux7gp1mYs[/video]
[video=youtube;ykI_y2X65TU]https://www.youtube.com/watch?v=ykI_y2X65TU[/video]
I'm also going to find a really high gravity planet that you're all having a meetup on and play Mussorgsky's Night on Bald Mountain as you get there.
[EVILLAUGH]
Edit: I just thought, after that and you're all there with you're tiny SCV's have an Anaconda very slowly pass overhead, blocking the star. Then I can play the last 30 seconds or so of Mars, Bringer of War. (I could do it with my Orca I suppose but a) Even in graphite livery it's not very...imposing and b) there's going to be dozens of Anacondas with you guys.)