I cannot take credit for this knowledge as that belongs to @7FeetUnder who was an exceptionally epic user for their generous explanation of what the functionality added from this "Description-less" MOD Re-Upload actually is. I'm only attempting to preserve their description for others to benefit from as well in case it becomes buried deep within the comments and thus lost to most.

"The lifestyle mod adds in a few interactions you can use to relax your character ingame (reduce unhappiness), those being meditation and playing music. It allows you to play any of the guitar-style instruments (and harmonica if you download the addon linked by Akrel lower in the comments) which will play an actual song and reduce you character's unhappiness. It even has the functionality to add song packs made by other users, for example, I have one I downloaded that adds all the guitar tracks from the S.T.A.L.K.E.R. series." Thank you @7FeetUnder!