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I am using The Imperial March as my default ringtone. No one else uses it, and most people chuckle when they hear it.

I have that, but its only tied to one contact.

My wife.

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My general ringtone is the opening chords of Sweet Child of Mine.
 
when works calls....Imperial march
when son calls...hey hey hockeytown, (we are Red Wings fans)
when daughter calls.....Mandy (her name really is Mandy)
when wife calls....Wicked witch from wizard of oz

but most of time, due to my work, phone is on vibrate
 
"Young Blood" by The Naked and Famous. The beginning of the song actually makes a great ringtone.

My gf has made fun of me that it is not exactly a "guy's" ringtone. Lol. However, the UFC fighter Mauricio "Shogun" Rua used it as his entrance theme in last week's main event. So I am vindicated. :D
 
My ringtone is the stock "Ascending" tone -- a two octave ascending chromatic scale on the xylophone.
 
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