Pretty self-explanatory. What instruments consistently make your favorite songs or sounds? Or, if you play instruments, which do you find more fun to play yourself?
Personally, my top few would go to violin, piano, acoustic guitar, electric guitar, castanets, and whatever the hell the whistling sound is here:
I love pianos and violins because of the passion and beauty they can put into things. Usually the most beautiful songs are composed with these instruments and have for centuries, and for good reason. I love acoustic guitars for really slow and often pretty solos, but I also love fast and passionate acoustic that is often accompanied with above referenced castanets to give music a Spanish-vibe. Electric guitars I like for pretty much the same reasons most everyone else likes them. There are tons of other instruments I love when I hear them, but usually I have no clue where to even start figuring out what it is, like the whistling I can hear in many songs I showed above. There are lots of sounds I like, I just don't know what they are, so I stuck mostly to what I know.
About the "Spanish-sounding" guitar with the castanets, perfect example right here: