Ganga and the Holy Trinity – Brahma, Vishnu, Mahesh
There was a time when Ganga was associated with the holy trinity all at one time.
Sage Narada, the son of Brahma, was extremely fond of singing, but his singing was not correct. As a result the ragas (combinations of musical notes, evoking certain moods) suffered inexplicable agony. When Narada comprehended the reason of the ragas agony, he promised to sing only when he had properly learnt to do so. But the agony of the ragas had to be healed and thus a musical concert by a master musician had to be arranged.
Besides Bhairav, who could be a better musician; hence, Narada approached Mahesh to sing and heal the ragas. Shiva agreed but on a condition that Vishnu and Brahma should listen to his recital, as a master musician needed master listeners. Both Vishnu and Brahma were delighted to have the opportunity to hear Bhairav sing and so they readily agreed.
At the first note of the concert, the ragas began to heal and soon they were all healed. So deep and soothing was Shiva’s musical rendering, that Vishnu was transported to raptures of divine joy and actually began to melt. Now Brahma collected the water emanating from the melting Vishnu in his kamandalu. After the concert was over, Brahma created Ganga out of this water. As her birth was under the most auspicious of circumstances, and being made out of the water that emanated from the melting of Vishnu, Ganga by birth obtained the power of purifying anything that came in contact with her.
Source by Rajen Jani