#1
Actually I have made this song and it only consists of two chords-A major and D major.So,it is in which key or scale?I want to make a solo but I need to know the scales so that I could be able to use it.
#3
It could also be in A major. I-IV progression is really common in pop music (I would say more common than V-I).

We can't tell without sound. It's either in D or A major. And songs are in a key, they aren't in a scale. Yes, you can play a scale over it and the notes you play are in a scale. But the song is in a key.

Music doesn't really work on paper so post us the song. But yeah, you could try both D and A major and see which one fits it better.
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Last edited by MaggaraMarine at Dec 11, 2013,
#4
It could be in either.

Assuming: A / D / A / D

If it's the key of D major, you are playing a V-I progression.
If it's the key of A major, you are playing a I-IV progression.

If you turned the A major into an A major 7th, it would have to be the key of A major since the G# contained in that chord would fall outside the key of D major.

If you turned the A major into an A dominant 7th, it would have to be the key of D major since the G contained in that chord would fall outside the key of A major.