Heartfelt does not mean what most CR readers seem to
think it means. Here’s what Google has to say:
“heartfelt”
(of a feeling or its expression) sincere; deeply and strongly felt.
“our heartfelt thanks”
synonyms: sincere, genuine, from the heart; earnest, profound, deep, wholehearted, ardent, fervent, passionate, enthusiastic, eager; honest, bona fide
The word refers to the sincerity of something, not how much feeling it evokes in its audience (though of course, something sincere is generally assumed to be more evocative.)
Thus, this thread’s question, taken literally, is
“What Jewish song do you think is the most sincere one?”
Maybe I should go with Pesach Moshe’s music, as I don’t think
anything other than sincerity could have gone into it.
Two posts do fit well with the correct meaning.
Bored123’s, here:
and DaasYochid’s here: