
das Album
album
A collection of pieces of music that is released as a unit by an artist or band, e.g. on a CD, record, or as a digital playlist.
Die Band hat gerade ihr drittes Album veröffentlicht.
The band has just released their third album.
album
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album
A collection of pieces of music that is released as a unit by an artist or band, e.g. on a CD, record, or as a digital playlist.
Die Band hat gerade ihr drittes Album veröffentlicht.
The band has just released their third album.

album
A book with blank pages used for pasting in or storing photos, stamps, postcards, or other collectibles.
Am Wochenende haben wir uns das alte Fotoalbum meiner Großeltern angesehen.
On the weekend, we looked at my grandparents' old photo album.
'Album' is often used as the head word in compounds to specify the type of collection. Examples are 'Fotoalbum' (photo album), 'Sammelalbum' (collector's album), 'Musikalbum' (music album), or 'Debütalbum' (debut album).
Für ihre Bewerbung erstellte die Designerin ein Portfolio-Album mit ihren besten Arbeiten.
For her application, the designer created a portfolio album with her best work.
You can easily recognize which meaning is intended from the context. Words like 'Band' (band), 'Sänger' (singer), 'Lieder' (songs), or 'veröffentlichen' (to release) point to a music album. Words like 'Fotos' (photos), 'einkleben' (to paste in), or 'Briefmarken' (stamps) point to a collection book.
Ich habe mir das neue Album meiner Lieblingsband angehört.
I listened to the new album by my favorite band.
In a musical context, 'Album' is often combined with verbs like 'aufnehmen' (to record), 'produzieren' (to produce), 'veröffentlichen' (to release), or 'herausbringen' (to bring out/release).
Die Sängerin wird nächstes Jahr ein neues Album aufnehmen.
The singer will record a new album next year.
When it is about a collection book, typical verbs are 'durchblättern' (to leaf through), 'ansehen' (to look at), 'gestalten' (to design), or 'etwas in ein Album einkleben' (to paste something into an album).
Wir haben den ganzen Nachmittag das alte Briefmarkenalbum durchgeblättert.
We spent the whole afternoon leafing through the old stamp album.
gallery
Both words can refer to a collection of images. An „Album“ is normally a deliberately assembled, defined selection, while a „Galerie“ usually means the entire digital collection of images or the corresponding view. „Album“ is appropriate for a selected collection, while „Galerie“ is appropriate for the complete view on a smartphone.

Für die Reise habe ich ein Album mit den schönsten Urlaubsfotos zusammengestellt.
I put together an album of the best vacation photos from the trip.
In der Galerie auf meinem Smartphone sehe ich alle Urlaubsfotos.
I can see all my vacation photos in the gallery on my smartphone.