Actually, the text of mantra sung in "The prayer" is:
Om
shuklaambaradharaM VishhNuM shashivarNaM chaturbhujam.
Prasana Vadanam Dyayethe, sarva vignobha upashanth aye!
vyaasaM vasishhTha naptaaraM shakteH pautramakalmashham .
paraasharaatmajaM vande shukataataM taponidhim
vyaasaaya vishhNuruupaaya vyaasa roopaaya vishhNave .
namo vai brahma nidhaye vaasishhThaaya namo namaH
avikaaraaya shuddhaaya nityaaya paramaatmane
sadaika ruupa ruupaaya vishhNave sarva jishhNave
yasya smaraNa maatreNa janma saMsaara bandhanaat
vimuchyate namastasmai vishhNave prabhavishhNave
oM namo vishhNave prabhavishhNave
shrii vaishampaayana uvaacha
First three lines are known as "Ganapati Dyanam"
Others I've found in "shrii vishhNu sahasranaama stotram", that originally is times longer. You can hear it live every morning at 5:00 a.m. in Pushkar (Rajastan), if you live close enough to Brahma Temple
