A newbie question about modes

Hi
I am just learning about modes, and have read a lot about them all over the place, and most is pretty clear.
What I want to know is if it is possible for a song to be in a minor key? and if it is, how do you apply the modes?
Thanks so much

Hi Raymond, Yes of course many songs are in Minor keys...A general difference between Major and minor is that Major is (happy & bright) and minor keys sorrowful. However, this analogy is not etched in stone "Yesterday for instance is sad but in a major key etc etc.
The difference in major and monir keys are as follows: All Major keys and scales have the following intervals between notes T=tone 2 Frets S=semi-tone 1 Fret

Major: T,T,S,T.T.T.S Minor S,T.T.S,T,T,T,

NB that the Aeolian "Mode" suits Minor But it doesn't have to be in that mode, Hopefully the following info will help:
modes can be arranged in the following sequence, where each mode has one more shortened interval from the tonic in its scale than the one preceding it, when the circle of fifths is followed. Thus taking Lydian as the base, Ionian (major) has a lowered fourth; Mixolydian, a lowered fourth and seventh; Dorian, a lowered fourth, seventh, and third; Aeolian (Natural Minor), a lowered fourth, seventh, third, and sixth; Phrygian, a lowered fourth, seventh, third, sixth, and second; and Locrian, a lowered fourth, seventh, third, sixth, second, and fifth. Or to put the same thing another way, the Augmented Fourth in Locrian has been reduced to a Perfect Fourth in Ionian; the major seventh in Ionian, to a minor seventh in Mixolydian; etc.
The Aeolian mode is a musical mode or, in modern usage, a diatonic scale.
The word "Aeolian" in the music theory of ancient Greece was an alternative name (used by some later writers, such as Cleonides) for what Aristoxenus called the Low Lydian tonos (in the sense of a particular overall pitching of the musical system—not a scale), nine semitones higher than the lowest "position of the voice", which was called Hypodorian.[1] In the mid-16th century, this name was given by Heinrich Glarean to his newly defined ninth mode, with the diatonic octave species of the natural notes extending one octave from A to A—corresponding to the modern natural minor scale).[2] Up until this time, chant theory recognized eight musical modes: the relative natural scales in D, E, F and G, each with their authentic and plagal counterparts, and with the option of B-flat instead of B-natural in several modes.[3]

NB Make sure you "Enjoy" your music you don't have to understand Einstein's theory of relativity in depth to understand "Gravity"

Look what trying to understand every single feature did to me ha ha.

Fenderbender.