Originally Posted by: LordLuzifernoticingthemistake: by 'the chords' were you referring to the keyboard parts?

Yeah.

Can I see that it's in these two keys without them (I haven't begun tabbing them yet)? If so, how? What gives it away?

The part most people aspire to play is the chromatic runs. The harmony of the guitar would be pretty stupid obviously. Just looking at that would led you to see the chromatic run starts on E and ends on A. So it's a chromatic scale in A. The last note always being the key note.

You can here the shifts in the key center if you listen to the harmony. The beginning in A minor, the first chord actually being Emajor (V of Am). When you here the harmony repeating the same pattern, you can also hear a shift in key, which is in D minor. That's what gives it away. However if you were to look at the actually score it would be hard to see since the whole score is filled with chromatic tones (the harmony too). The last chord played in the whole piece is an A minor chord. In classical music, the last chord is always the tonic.