In Plain Sight

On holiday in Lisbon, going round the zoo,
I suddenly remembered that I had a job to do.
I had to write with some aplomb, as soon as I could;
with so much going on, gracious me would it be good?!

Well, I'd already had rum, so while I sat down to think,
I ordered ravioli, nicely washed down with more drink.
It was an urban joke, being so very sleep-deprived;
Inspiration really lagged, but regardless, it arrived.

To finish this, I had to have a stab, late at night.
When my phone began to buzz, it heralded the light.
Although my work is finished, I'm still feeling quite perplexed—
can you find ten instruments I've lost within this text?