A la salida del estadio, la afición seguía cantando.

It means something like on leaving the stadium, as people were coming out of the stadium, or outside the stadium after the event.

This expression is very common in Spanish:

• a la salida de... = at the moment of leaving / when coming out of
• del estadio = of the stadium / from the stadium

So it is not just talking about the physical exit door. It usually refers to the moment or situation around leaving the place.

Because de + el contracts to del in Spanish.

So:

• de + el estadio → del estadio

This contraction is mandatory in standard Spanish, except when el is part of a proper name, such as de El Escorial.

Because a la salida is a fixed, idiomatic expression that often refers to a time or circumstance, not just a location.

Compare:

• a la salida del estadio = when leaving the stadium / outside as people came out
• en la salida del estadio = at the stadium exit, focusing more on the physical place

In this sentence, the idea is more about the moment or situation than the exact spot.

In Spain, la afición very often means the fans, the supporters, or the crowd supporting a team.

Literally, afición can also mean fondness, enthusiasm, or hobby in other contexts. But in sports contexts, especially in Spain, it commonly refers to the supporters as a group.

So here la afición is not one single person. It is a collective noun referring to many fans.

Because la afición is grammatically singular, even though it refers to a group of people.

Spanish often uses singular verbs with collective nouns:

• La gente está contenta
• La afición seguía cantando

This is similar to English words like the crowd or the team, which can also be treated as a single unit depending on the variety of English.

Seguir + gerund means to keep doing something or to continue doing something.

So:

• seguía cantando = was still singing / kept on singing / continued singing

The important idea is continuation. The fans had already started singing before that moment, and the singing was still going on.

Because seguía is the imperfect, which presents the action as ongoing, in progress, or background information.

• seguía cantando = the singing was still going on
• siguió cantando = he/she/it continued singing, seen more as a completed narrative event

In this sentence, the imperfect fits because the scene is being described rather than presented as a single completed action.

Because after seguir, Spanish normally uses a gerund to express an ongoing action:

• seguir cantando = to keep singing
• seguir hablando = to keep talking
• seguir lloviendo = to keep raining

Using the infinitive here would be incorrect:

• seguía cantar ❌

So seguir + gerundio is the standard pattern.

Yes, but it would not mean exactly the same thing.

• estaba cantando = was singing
• seguía cantando = was still singing / kept singing

Estaba cantando simply describes an action in progress.
Seguía cantando adds the idea that the action had started earlier and had not stopped.

So seguía cantando is more precise here because it emphasizes continuation.

Because A la salida del estadio is an introductory time expression, and Spanish often separates that kind of phrase with a comma.

It works a bit like:

• After the match, the fans were still singing.

The comma helps mark the scene before giving the main statement. In some short sentences, people may omit it, but here it is natural and clear.

The accents show correct stress.

• seguía is stressed on -guí-
• afición is stressed on the last syllable, -ción

In seguía, the accent also helps show that the vowels are pronounced separately:

• se-gu-í-a

In afición, the accent is needed because words ending in n are normally stressed on the second-to-last syllable, but here the stress falls on the last one:

• a-fi-ción

Yes. You could also say:

La afición seguía cantando a la salida del estadio.

That is still correct. The original version puts A la salida del estadio first to set the scene immediately. This is very common in Spanish when introducing time or place information.