Pidin settilistasta, erityisesti tarttuvasta kertosäkeestä.

Because the verb pitää in the sense to like or to be fond of takes its complement in the elative case (-sta / -stä, often thought of as the from case).

So:

• pidin settilistasta = I liked the setlist
• literally, it is something like I held from the setlist, but in real Finnish it simply means I liked the setlist

This is just how the verb works in Finnish. It is not a direct object pattern like English I liked the setlist.

Compare:

• Pidän kahvista. = I like coffee.
• Pidimme elokuvasta. = We liked the movie.

So in your sentence, settilistasta and kertosäkeestä are in the case required by this kind of expression.

Pidin is the first person singular past tense of pitää.

So:

• pidän = I like / I hold
• pidin = I liked / I held

In this sentence it clearly means I liked.

A small warning: Finnish pitää has several meanings, including:

• to like → Pitää jostakin
• to hold → pitää kädessä
• must / have to in some structures → minun pitää lähteä

Here it is the to like meaning.

Because tarttuvasta kertosäkeestä is one noun phrase, and the adjective must agree with the noun in case and number.

So:

• kertosäe = chorus / refrain
• kertosäkeestä = from the chorus / of the chorus in the elative
• tarttuva = catchy
• tarttuvasta = catchy in the same elative form

This is normal Finnish adjective agreement:

• kaunis talo = beautiful house
• kauniista talosta = from the beautiful house

Likewise:

• tarttuva kertosäe = a catchy chorus
• tarttuvasta kertosäkeestä = from the catchy chorus / the catchy chorus, in the required case

Yes, it comes from the idea of sticking or catching on.

The verb tarttua can mean things like:

• to stick
• to catch
• to be caught
• in some contexts, to become contagious / spread

From that, tarttuva literally means something like catching or contagious, but in music it often means catchy.

So tarttuva kertosäe is a very natural way to say a catchy chorus.

It is similar to English, where catchy also comes from the idea that a tune catches in your mind.

Yes, in this context kertosäe means chorus or refrain in a song.

It is built from:

• kerto- related to repeating
• säe = line, verse line

So the word has the sense of a repeated line/section.

In everyday music talk, kertosäe is the standard Finnish word for chorus.

Erityisesti is an adverb meaning especially, particularly, or in particular.

So:

• Pidin settilistasta, erityisesti tarttuvasta kertosäkeestä. = I liked the setlist, especially the catchy chorus.

It highlights one part of what was liked more specifically.

Other examples:

• Pidän suomalaisesta ruoasta, erityisesti karjalanpiirakoista. = I like Finnish food, especially Karelian pies.
• Hän pitää musiikista, erityisesti jazzista. = He/She likes music, especially jazz.

The comma helps separate the general statement from the more specific added detail.

Structure:

• Pidin settilistasta = general statement
• erityisesti tarttuvasta kertosäkeestä = added specification: especially the catchy chorus

In English, you would often do the same:

• I liked the setlist, especially the catchy chorus.

The comma is natural here, though punctuation can sometimes vary depending on style and sentence rhythm.

Yes. Settilista is a common modern Finnish word, especially in music contexts, and it is basically a loan-based formation from English set list.

It means the list of songs played in a performance.

Its forms are:

• settilista = setlist
• settilistan = setlist (genitive / accusative in some contexts)
• settilistasta = from the setlist / of the setlist, in the elative

Finnish often adapts international words to Finnish spelling and inflection, and this is a good example.

Yes. That would be a perfectly natural sentence.

• Pidin tarttuvasta kertosäkeestä. = I liked the catchy chorus.

The full sentence with settilistasta first gives a broader idea:

• I liked the setlist, especially the catchy chorus.

So the original sentence moves from the whole thing to one especially liked part.

Grammatically, it says the speaker liked the setlist, and then singles out the catchy chorus as something especially liked.

That sounds slightly unusual if you think of a setlist as just a list of songs, because a chorus belongs to a song, not to the list itself. But in real language, speakers sometimes use this kind of shorthand when talking about a performance or a musical selection.

So depending on context, it may really mean something like:

• I liked the set / selection of songs, especially the catchy chorus
• or I liked what they played, especially the catchy chorus

A learner might notice that the logic is a bit compressed, but the grammar itself is straightforward.

Yes, that is a possible nuance in Finnish because the elative with pitää is already required by the verb, and erityisesti simply highlights one element within what was liked.

So the main meaning is still:

• especially the catchy chorus

But depending on context, it may feel close to:

• especially because of the catchy chorus
• with the catchy chorus being the standout part

Finnish often allows this kind of slightly flexible interpretation when the grammar is economical and context fills in the rest.