GillAUS ji,
Guru Fateh.
You write:
They are there to aid the understanding of the philosophy of Sri Guru Granth Sahib.
I beg to disagree with your above assertion. SGGS needs no aid from anyone especially Bahi Gurdas ji who had a Hindu mentality. SGGS is stand alone "Toolbox". IT gives us the tools how to breed goodness within.
Guru Nanak says in Japji:
"Gaviei suniei,munn rakhiei bahao, Dukh parHar sukh ghar lei jai"
In the above pauri and in many others one can find the aid/key to understand the philosophy of SGGS.
We chant Gurbani from Sri
Guru Granth Sahib Ji loudly because it is written in the poetic and musical form. This was a great idea by our visionary Gurus. By chanting and singing Gurbani loudly, one liberates oneself from the self created cocoons, one breaks the walls one has constructed around him/her. One bursts out of the self made bubble. Once this is done then our visionary Gurus tell us to study Gurbani so that we can understand it, put it into practice so that it can become our second nature which in result will help us elevate our level of normalcy. By understanding and then putting Gurbani into practice,what seemed impossible yesterday, becomes probable today and then with HIS grace- Nadar-, it ought to become a piece of cake the next day.
One can open the Guru Granth randomly on any page and find the inspiration, motivation, determination, perseverance and, last but not least, the acceptance of
Hukam.
So, as you can see, SGGS needs no "Cliff notes".
Hence Guru Gobind Singh ji bestowed Guruship on SGGS. IT is our only GURU. Why would our GURU need an aid? Did other Gurus need that?
Something to ponder about.
History says that even Guru Arjan Dev ji referred to Bhai Gurdas's writings as being a 'key'.
Yes, it is said by many but there is no proof because the fact remains SGGS is complete and stand alone. The reason for this belief in my opinion is because Punjabi culture in ingrained with finding "facts" through second hand information. It is due to the heirarchial culture. Whatever our own elders or other elders say, we believe in it blindly. Guru Nanak eliminated the heirarchy starting with our second Guru Angad rather than his own son. The same concept continued and we had Guru Harkrishan as our 8th Guru. Elders can be wrong and are wrong many a times. There is nothing wrong with that.
What it teaches us as Sikhs is to seek for the first hand information on our own through SGGS, our only stand alone aidless GURU.
Tejwant Singh