The sound of ’90s R&B seems to be all the rage nowadays. Therefore, it only makes senses that some of our faves from one of the genres golden eras would want to bask a little in all that shine. Welp, ladies, we hope you’re ready to feel like it’s 1997 all over again because Jon B and Donell Jones have teamed up for the unexpected R&B collaboration that you didn’t know you wanted. The duo have released their anticipated single “Understand,” the newest single from Jon that features both crooners doing what they do best. In a brilliant collaboration with sumptuous, sexy and intriguing vibes and lyrical genius, this new track embodies pure genius.…