Drop D at an even 18/16. If you want to overlay the keyboard part, its reverb amounts to triplets over each beat of this melody. e|-----------------------------------------------------------------------| B|-----------------------------------------------------------------------| G|9---------------------5-7---------------------3-5----------------------| D|--7---9-------2-5-4-7-----5---7-------0-3-2-5-----3---5---------0-0-3-5| A|----5---7---2---------------3---5---0---------------0---3-----3--------| D|----------5-----------------------3-----------------------0-5----------|