Just wanna make sure,

What scales are used in Stairway to Heaven, Since I've been loving you, and Whole Lotta Love?
I don't know since I've been Loving You but I know that stairway to heaven is almost entirely A minor with mainly minor pentatonic in the solo and I'm pretty sure the Whole Lotta Love riff is entirely natural minor/minor pentatonic.
R.I.P. My Signature. Lost to us in the great Signature Massacre of 2014.

Quote by Master Foo
“A man who mistakes secrets for knowledge is like a man who, seeking light, hugs a candle so closely that he smothers it and burns his hand.”

whole lotta love - try Em pentatonic or blues
since i've been loving you - Cm blues