Hi Caponi14,
This seems like kindov a tough one because emotion is a feeling and not as easy to describe as a specific riff but I'll chime in with what comes to my mind when I think about this...I would maybe try holding one note over chord changes to help slow yourself down and see the effect that it gets. When the chord changes underneath your note it's almost like the note itself is changing but it's not. This adds an emotional element. Try it with a sloow vibrato.
Also, when you're soloing over chord changes think about the notes in the chord being played (1,3,5, etc.) If you're on a note that's also in the chord underneath it, that really enhances the sound of the solo and it sounds like you know what you're doing.
The best notes to add emotion in a solo (to me) are the 3rd and the 7th, both very bend-able notes, try messin' around with those, Slash uses 'em alot! If you're in the key of 'E' they would be the 'G' and the 'D', 3 great notes to focus on in that key!
If a chord is changing from an 'A' to a 'G' lets say, you could bend up from the 'g' note to an 'a' and hold it. As the chord changes down to the 'G' gradually release the note down to the 'g'. Alot of emotional soloing is kinda lazy, behind the beat..almost drunk sounding so don't be too concerned about being on the beat but a little after it...like pouring molassas over a solid structure.
Here's an excercise for ya: play along to the verse of 'Sweet Child of Mine' only using 2 notes (individually). d flat on the g string, 6th fret AND f on the b string, 6th fret (normal tuning). Just let the song play and bend the d flat up a whole step and back down whenever you feel like it..also bend the f up a half step and back down whenever you feel like it. Try different variations..bend up first, then strike the string and release, bend up and down in succession, etc. this will give you an idea of how playing the same note over a chord change will make your solo sound like it's changing even though it's not.
Mimicing the song's melody in the solo is a good idea and I remember Santana saying he would imagine his guitar was talking as he played, he would think of something to say and make the guitar sound like it was saying it (as much as he could).
Let me know if this opens any doors (or windows) for you. :D
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