[Verse 1]
When bonds trade above their benchmark treasuries
The gap reveals what investors really see
G-spread takes the government yield away
Shows you the premium that corporate bonds pay
[Verse 2]
But when the curve slopes up or down too steep
G-spread alone won't cut it deep
Z-spread's the wizard, strips away the curve
Shows constant margin that bonds deserve
[Chorus]
G for Government, simple subtract
Z for Zero-curve, that's a fact
I for Index, swap rates aligned
OAS cuts through options to peace of mind
Spreads tell stories, risks unfold
Each one measures worth like gold
[Verse 3]
I-spread dances with the swap rate beat
LIBOR's cousin, floating neat
When credit markets shift and sway
I-spread shows the cleaner way
[Verse 4]
But embedded calls and puts disguise
The real spread beneath bond's lies
OAS strips options from the game
Shows pure credit risk by name
[Chorus]
G for Government, simple subtract
Z for Zero-curve, that's a fact
I for Index, swap rates aligned
OAS cuts through options to peace of mind
Spreads tell stories, risks unfold
Each one measures worth like gold
[Bridge]
Callable bonds need OAS precision
Interest rate risk needs clear division
Static spreads mislead your choice
OAS gives credit its true voice
[Chorus]
G for Government, simple subtract
Z for Zero-curve, that's a fact
I for Index, swap rates aligned
OAS cuts through options to peace of mind
Spreads tell stories, risks unfold
Each one measures worth like gold
[Outro]
Four spreads dancing, each unique
Find the metric that you seek
Credit analysis complete
When all four spreads finally meet