do you know the trills?

Really good songs! Yeah, I've noticed that many ARABIC and HEBREW songs people start to trill. In Portuguese I don't see people doing it, but I start to shiver when the trill is well done :) It would be weird if in Finnish people trill, haha! It's not a melodic language, and it has to be pronounced the most monotone as possible so... ;)

A song I love:

All of the videos you included, except for the last one, are no longer available. (Apparently they were posted to YouTube without the copyright holders' permission, so they've been taken down.)

We usually use the word "trill" for the thing Spanish speakers do with the double R, wherein their tongue vibrates when they pronounce the phoneme. The word might have other meanings as well, but I don't know any others that make sense in this context.

I looked up silsolim on YouTube and watched all of the four or five clips that turned up, but the major thing I could hear in most of them that was different from American music was the presence of guttural consonants (particularly heth), and I'm pretty sure that's not what you're talking about. I mean, German music would have that as well, or Klingon music, or music in any other language that has such consonants.

I thought about trying to reverse-transliterate it back to the Hebrew letters and search for that, but I wasn't sure which letter the S represented. (Samekh? Sin? Shin? Tsadhe? Are the two sibilants in the word even the same letter as each other?) I found some results for סלסלים, but they appear to be all exactly the same song, so I'm not sure whether that's even the right word, let alone which aspect of the song's style the word might mean.

I did notice something near the beginning of the third video you included: the vocal part holds the same syllable over a whole bunch of notes. If that's what you're talking about, it used to be very common in Western music, up through the Baroque period, but it has become much less common lately. Counterpoint fell out of common use around the same time (and was replaced with harmony). I'm not certain, but I think the two things may be related, because stretching a single syllable over multiple notes may have been used by composers as a way of getting the lyrics to line up with the music when the principle of contrary motion created a situation wherein one vocal part needed to have many more notes per measure than another part even though they were singing basically the same words. (Another solution would be to give one of the parts extra words, but most composers in that era focused mainly on writing better music; the words were considered secondary.) With counterpoint all but extinct after the Romantic era (starting circa 1750), there's less reason to stretch a single syllable over multiple notes, and so most songs aren't written that way now. Also, modern songwriters in the West tend to write the lyrics first and then write the actual music to fit the words, rather than the other way around.

Sometimes you'll see two notes on the same syllable in modern Western music, up to two or three times per song, but that's generally about it. Most of the really well-known exceptions are fairly old songs. The most famous example I can think of with a lot of it all in one song is probably "O Come O Come Emmanuel", which was originally written in Latin during the medieval period and several centuries later was translated to English (and probably various other European languages, I imagine).