Friendship Through the Ages

[Jorlem]

Lyrics:

Spoiler

[Twilight Sparkle]
Nothin' stays the same for long
But when it changes, doesn't mean it's gone
Time will always get away
As it leaves behind another day
[Fluttershy]
Things may come and things may go
Some go fast and some go slow
Few things last, that's all I know
But friendship carries on through the ages
[Rarity and Fluttershy]
Things may come and things may go
Some go fast and some go slow
Few things last, that's all I know
But friendship carries on through the ages
[Rainbow Dash]
Been around for a long time
Rockin' out hard, 'cause I'm in my prime
Maybe it'll change further down the line
But my friendship carries on through the ages
[Applejack]
Every single style has somethin'
Diff'rent it can say
There's nothin' wrong with bein' unique
And special in your own way
[Pinkie Pie]
Maybe you wanna be a pop star
Get your fifteen minutes of fame, wah-ah, oh!
That won't last forever
But friendship remains the same, ah-oh, oh!
[The Rainbooms]
Things may come and things may go
Some go fast and some go slow
Few things last, that's all I know
But friendship carries on through the ages
Things may come and things may go
Some go fast and some go slow
Few things last, that's all I know
But friendship carries on through the ages
Oh, oh, carries on

I'm thinking something to bring together friends who are separated, or have drifted apart.  Maybe something similar to the effect of We Didn't Start the Fire, but focusing on the positive memories or experiences the once-friends shared?  Could also be helpful for breaking someone out of the sort of brainwashing or mind control used to turn them against their allies, by aiding in reminding them of who they really are. 
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Stand between the Silver Crystal and the Golden Sea.
"Youngsters these days just have no appreciation for the magnificence of the legendary cucumber."  --Krityan Elder, Tales of Vesperia.