The most SOULFUL croon of Himesh EVER is his line, MERI JAA-AAAAN-NNNN (gradually rising soulful killer croon) from 1.09 to 1.18 & 1.50 to 1.58 from HUM TUM TRAIN KI from DAMADAMM.
This can be also evidenced in his same line JAAN - AA - AA - AA (gradually rising soulful killer croon) from 12.14 to 12.20 in the above video...yeh hai ROOH KI PUKAR which is straight from the bottom from his heart.
Thats why the catch phrase to sum up Himesh - the singer is "joh awaaz dil se nikal ke rooh koh chu jaaye, woh awaaz Himesh Reshammiya ki hai"
Himesh has also made use of additional male / female killer soulful croons that are intense in nature and convey / depict the 'desperation plea' and/or 'helplessness' quotient factor:
> Kailash Kher's soulful croon from 1.11 to 1.13 in MEETHI MEETHI BAATAN from AAP KI KHATIR.
> The soulful male croon from 0.44 to 0.51 in AAMDANI ATTHANI KHARCHA RUPAIYA TITLE TRAX.
> Sonu's soulful croon from 2.08 to 2.12 & 2.33 to 2.37 in BHANGRA PAALE from AAP KI KHATIR.
> Sonu's soulful classical croon from 4.52 to 5.04 in YEH JODI HAI NO.1 from JODI NO 1.
> The soulful female croon from 3.30 to 3.32 & 3.31 to 3.33 in CHURA LO - VERSION 1 & 2 from TAARZAN - THE WONDER CAR.
> The soulful male croon from 1.36 to 1.55 in O PRIYA O PRIYA from KAHIN PYAAR NA HO JAAYE.
> The continuous soulful female croon from 0.54 onwards in the background behind Himesh's vocals in TERE BINA from AKS - THE MOVIEE.
> The soulful Arabic male croon from 3.21 to 3.57 in WOH LAHMA PHIR SE JEENA HAI from KAJRAARE.