The combination of "Diwali" and "Lakshmi" makes sense! It's been so long since I attended a Lakshmi worship ritual that I've forgotten what gets chanted. The traditional music is monophonic. The track you linked to definitely a modern re-interpretation. Maybe people are coming up with some seasonal music all around me, and I'm just unaware. The way that Coca Cola re-invented Christmas for Americans, maybe a handful of people are re-inventing Diwali celebrations all around me! To me, all these festivals mean I get to binge on sweets.