Here is a list of some Asa ki Vaar recordings that I like. Also notice our blog post related to this topic: Asa KI Vaar or Asa DI Vaar?
The first recording one is done by Bhai Baljeet Singh and Bhai Gurmeet Singh with tanti saaz (although a better mastering job is definitely possible here):
Asa ki Vaar - Bhai Baljeet Singh, Bhai Gurmeet Singh
The second one by Bhai Gurmeet Singh Shaant starts with a melodius Bhinni Rainariye in an ever majestic and hopeful taal Deepchandi:
Asa ki Vaar - Bhai Gurmeet Singh Shaant
At Gurmatchanan.com there is a compilation of Asa ki Vaar from various Ragis: Gurmatchanan.com Asa ki Vaar. Others that I like here are:
Asa ki Vaar - Bhai Rajinder Singh
Asa ki Vaar - Bhai Inderjeet Singh
Asa ki Vaar - Bhai Kirpal Singh
Asa ki Vaar - Bhai Tejinder Singh
Asa ki Vaar - Bhai Taralbir Singh
Asa ki Vaar - Bhai Sukhwinder Singh
Some rare recordings:
Asa ki Vaar - Bhai Lal
Asa ki Vaar - Bhai Surjan Singh
For the classical music enthusiast, its worth noting that several morning Raags are used in Asa ki Vaar; I have yet to hear an Asa ki Vaar sung entirely in Raag Asa.
For example the following is just the beginning of Asa ki Vaar -- a polished recording, but the flute starts with Asa Maand not Asa (thats a usual problem when you ask an Indian classical musician to play Asa, they do Asa Maand). Notice how Asa transitions into Bilawal in the middle.
Asa ki Vaar - Bhai Balwinder Singh
Info on Asa ki vaar: http://www.sikhiwiki.org/index.php/Asa_di_Var
Text and Translation - http://www.sikhiwiki.org/index.php/Asa_di_var_Page_1
Katha - Asa ki Vaar - Sant Singh Maskeen
A nice series of videos of Bhai Ravinder Singh singing Asa ki Vaar:
Another one worth mentioning features the classic Bhai Surjan Singh ...
... who sings the omnipresent "Jo Mangeh Thakur" as part of Asa ki vaar: