I read that Sai Baba would sometimes sing about Udi. What was the song and what did it signify?

Yes, when Sai Baba became absorbed in love and his mind grew playful, he was heard singing a very sweet song. Chapter 33 records the refrain he would sing again and again: "Ramate Rama Ayoji Ayoji, Udiyan ki Goniyan Layoji," which means "Rama rejoices, O mother, bringing bags of Udi." This song signifies the joyful and boundless production of the sacred ash from his Dhuni. The text emphasizes that Baba's Dhuni produced countless bags of Udi, more than anyone could possibly count, highlighting its supreme abundance and auspicious nature.