Check out the 1st edition of the Neo Soul Construction Kits Vol 1. This pack feature 5 smooth Neo Soul / R&B Type tracks including electric guitar riffs.
All tracks have stems for all instruments, Drums, Bass, Keys, Guitars, Synths, Horns etc. It also includes the MIDI files. Some have the text files with the chord information, I am currently updating all tracks with the same information.
Note that the tracks are 100% Royalty free however Soulful Keys still owns the rights to the tracks. Please contact me for further information on using the tracks for commercial release.