I understand that Shirah is usually associated with the miraculous defeat of enemies, but I don't see any reason it should be limited to it.
- Undoubtedly, the Matan Torah was a crucial event in the history of the whole world - God finally gave the Jews a precious present that would change the history of humankind.
- Alternatively, one might see it as the miracle of the mass Divine revelation to the Israelite nation, and some say, all generations of Jewish souls.
- Some may even see it as the day of divine marriage between God and the Jews — the more the merrier - more reasons to sing Shira.
It appears, however, that neither the scripture nor the majority of commentators see Matan Torah as Shira-worthy - in the end, the Israelites get genuinely scared, return to their tents, and keep complaining about wandering in the wilderness.
So, was Matan-Torah worthy of singing Shira, and if yes, why didn't Moses, Miriam, and the rest sing?
Special thanks to @shmosel.