It means that the credits associated with each picture in an album are like little pieces of a narrative. For example, the photographer's name in the credits might tell you about the creative vision behind the shot. If a particular location is mentioned, it could be part of the story of how the picture came to be, like it was taken during a special trip or event at that place.
Album credits can be used to tell a story by simply showing who was involved. For instance, if a famous artist is credited for a picture, it adds to the story as it might be a part of their body of work. The credits for the lighting crew can also tell a story. If it says 'natural light' in the credits, it gives an idea of the setting and how the picture was captured without artificial lighting.
Once upon a time, there was an old attic filled with dusty photo albums. One day, a young girl named Lily ventured in. She opened an album and saw a picture of a grand old house. In the picture, there were people on the porch, smiling. She started to imagine their lives. Maybe it was a family gathering. The kids were excited for the homemade pies their grandmother was baking. The men were chatting about the latest news in the town. This simple picture made Lily realize how much a single image could hold a whole world of stories.
It could mean that just like a track listing gives an overview of the musical journey in an album, each picture in a visual medium (like in an album cover art collection or a photo series) has a story to tell. For example, in an album, the track listing sets the order and expectation of the musical experience. Similarly, pictures can be arranged in a sequence where each one conveys a part of a bigger narrative, whether it's about the artist's emotions, the theme of the work, or a story related to the music.
Well, to find the chords for 'Every Picture Tells a Story', you might want to check some music books dedicated to the artist or the song. It could be chords like G, C, D that are commonly used in many folk - rock type of songs, but without proper research it's hard to say for sure.