An InsertSong is a song with lyrics that is inserted during a certain scene of a show or series. Usually, this is done to give a scene more emotional impact by using a song with lyrics which relate to the scene in question. Sometimes though, especially if it's a music-oriented show, the creators will have the characters play a song in-story.

What sets the in-story version apart from a regular MusicalEpisode is that there has to be something important happening in-story as justification for why someone is singing, and that the entire cast doesn't have to be involved.

This is very common in anime, as detailed in AnimeThemeSong, since most voice actors/actresses also happen to be popular singers.

Note that the opening theme only counts an example if it's used in the middle of the show, when something is actually happening. And the ending theme doesn't count as an example if it starts during a scene which segues into the credits.

Compare AnimeThemeSong (the opening theme, which can be used as this sometimes), ImageSong (can overlap with this if the song in question is brought into the show), {{Leitmotif}} (when a particular piece of music is tied to a certain character), and ThemeMusicPowerUp (when epic BGM is playing while a character is kicking ass).
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!!Examples:
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[[folder:Anime]]
* The ''LyricalNanoha'' series has several:
** [[http://www.youtube.com/watch?v=_dNDaJFmkQY Take A Shot]] from ''Anime/MagicalGirlLyricalNanoha''
** [[http://www.youtube.com/watch?v=06cIayCPSlU Brave Phoenix]] from ''Anime/MagicalGirlLyricalNanohaAs''
** [[http://www.youtube.com/watch?v=msPlwu7wEQk Pray]] from ''Anime/MagicalGirlLyricalNanohaStrikerS''.
* ''LightNovel/HaruhiSuzumiya'' also has a couple:
** [[http://www.youtube.com/watch?v=6kv3mMK7EP8 God Knows]] is used as the concert version of this trope, along with [[http://www.youtube.com/watch?v=MI_wWlz2Rck Lost my music...]]
* Being a show about girls forming a music club, ''KOn'' has quite a few, such as [[http://www.youtube.com/watch?v=rvAR8tiQbsQ Fuwa Fuwa Time]].
* ''Anime/DigimonXrosWars'' has [[http://www.youtube.com/watch?v=4OV9pRh5ZOs this]], [[http://www.youtube.com/watch?v=KpDYg_WK6rU this]], and [[http://www.youtube.com/watch?v=fxBQPjVWspM this]].
* ''Anime/MekakucityActors'': Given that it's an anime based on a [[LightNovel/KagerouDays manga and light novel]] based on a [[Music/KagerouProject set of songs]], this was bound to happen: (Warning, spoilers)
** ''[[https://www.youtube.com/watch?v=0buNdJyQfKU Kisaragi Attention]]'' at the end of episode 2.
** ''[[https://www.youtube.com/watch?v=FfBXWF6gQnQ Mekakushi Code]]'' at the end of episode 3
** And ''[[https://www.youtube.com/watch?v=VXyOuzLdP_E Kagerou Days]]'' at the end of episode 4.
* ''Anime/TengenToppaGurrenLagann'' has several.
** ''[[https://www.youtube.com/watch?v=g2XsAhmrbc4 Happily Ever After]]''.
** ''[[https://www.youtube.com/watch?v=aNQvLECht08 Sorairo Days]]'' in episode 26
** The "Row! Row! Fight the Powah!" rap is featured in a few songs, most notably ''[[https://www.youtube.com/watch?v=G2AxpaH56WY Libera Me From Hell]]''.

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[[folder:Film]]
* ''Film/SuckerPunch'' had several, such as [[http://www.youtube.com/watch?v=jZMrp8yDM78 this]].
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[[folder:Visual Novels]]
* ''VisualNovel/KiraKira'', being a VN about forming a rock band, has gems such as [[http://www.youtube.com/watch?v=brFnRTl_Q-c Let's Jump]], [[http://www.youtube.com/watch?v=ENi8XAEDG6I Kimi no Motoe]], and a rock version of their school theme, [[http://www.youtube.com/watch?v=vC7D6sVBRnM O. H. B. I.]], all of them performed during their concerts.
* ''VisualNovel/MuvLuvAlternative'' has Takeru's ImageSong, [[https://www.youtube.com/watch?v=jJigmBa1e5c Wings]], play [[spoiler:at the end of the PTSD Arc, when he finally finds his resolve to save the world]]. [[https://www.youtube.com/watch?v=qiTfpxxqI2g Carry On]], another insert, plays at the start of the last arc. The all-ages edition also has the opening play when the last arc is well underway.
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[[folder:Western Animation]]
* ''PhineasAndFerb'' has several, considering that the entire series runs on {{Musical Episode}}s.
* ''TheFairlyOddParents'' also has a number of them, such as [[http://www.youtube.com/watch?v=4IRdw_Qgwqc My Shiny Teeth And Me]].
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[[folder:Video Games]]
* Averted in ''{{Halo 2}}''. In-game, we hear the instrumental version of ''[[https://www.youtube.com/watch?v=lSgQGKZocDA Blow Me Away]]'' by ''Music/BreakingBenjamin''. The [[https://www.youtube.com/watch?v=svdR8_w1N0Y original]] is featured in the game's soundtrack.
[[/folder]]