zhège gēdān lǐ yǒu hěnduō gē.

Because 这 / 那 normally need a measure word before a noun in Chinese.

So:

• 这 + 个 + 歌单 = this playlist
• 那 + 个 + 歌单 = that playlist

Here, 个 is the measure word being used with 歌单. It is the most common general-purpose measure word, and learners will see it very often.

里 is a location word / localizer meaning inside or in.

So:

• 歌单里 = in the playlist
• literally, inside the playlist

In this sentence, 这个歌单里 sets the location or context for what follows.

Because 里 is not a normal descriptive modifier. It is a localizer that attaches directly to a noun.

So Chinese naturally says:

• 歌单里 = in the playlist
• 房间里 = in the room
• 书包里 = in the bag

Using 的 here would be wrong in this basic structure.

Because 有 is used to show existence or presence: that something is there or exists in a place.

So:

• 这个歌单里有很多歌 = There are many songs in this playlist
• literally: In this playlist, there exist many songs

By contrast, 是 is used to say one thing is another thing:

• 这个是歌单 = This is a playlist

So 有 is the correct verb here, not 是.

It can match both in natural English, but the Chinese structure is closer to:

• There are many songs in this playlist

That is because Chinese often uses:

• place + 有 + thing

So the sentence is structured as:

• 这个歌单里 = in this playlist
• 有 = there is/are
• 很多歌 = many songs

In good English, This playlist has many songs is also a perfectly natural translation.

Yes, you can, and people will understand it.

But in sentences with 有 that mean there is/there are, Chinese very often does not need 在. The location can appear directly before 有:

• 这个歌单里有很多歌
• 桌子上有一本书

This pattern is very common and natural.

So 在这个歌单里有很多歌 is possible, but 这个歌单里有很多歌 is simpler and very standard.

Because in Chinese, words that describe quantity usually come before the noun.

So:

• 很多歌 = many songs
• 很多人 = many people
• 很多问题 = many questions

This is normal Chinese word order.

Both are possible:

• 很多歌
• 很多首歌

首 is the specific measure word for songs. So 很多首歌 is a little more explicit.

But in everyday Chinese, people often omit the measure word after 很多, especially when speaking generally. So 很多歌 is completely natural.

You can think of it like this:

• 很多歌 = many songs
• 很多首歌 = many songs, with the classifier stated clearly

Both are correct.

Because Chinese nouns usually do not change form for singular vs. plural.

So:

• 一首歌 = one song
• 很多歌 = many songs

The noun 歌 stays the same. The amount is shown by other words such as:

• 一
• 很多
• 几
• 一些

This is very different from English, where we usually add -s.

Yes. That is also natural.

Compare:

• 这个歌单有很多歌 = This playlist has many songs
• 这个歌单里有很多歌 = There are many songs in this playlist

The version with 里 emphasizes the idea of inside the playlist a little more. The version without 里 sounds a bit more direct and possession-like: the playlist has many songs.

Both are good.

In careful standard pronunciation, it is commonly given as zhège.

So the start of the sentence is:

• 这个歌单 = zhège gēdān

In everyday speech, the 个 may sound lighter, but for learning purposes, saying zhège is perfectly fine.

歌单 is a compound noun:

• 歌 = song
• 单 = list/form/sheet

So 歌单 literally means something like song list, which is why it means playlist.

This kind of compact noun-building is very common in Chinese.

A very useful pattern here is:

• place + 有 + noun

Examples:

• 房间里有一个人。 = There is a person in the room.
• 桌子上有一本书。 = There is a book on the table.
• 这个歌单里有很多歌。 = There are many songs in this playlist.

This is one of the most common ways to say there is / there are in Chinese.