Play Store App vs Play Store iDoser music?

[TahurJourney]

Hi! I just bought the Premium App in the Play Store and I figure out how different are the doses from other sources, as well as the available doses on the app.
Then I found some packs in the Play Store in the Music pages; why do the doses are there at $1 when the same doses through the Premium app are at $3?
What's the difference between those doses? I alreaalready read that the doses from the website are quite different from the app ones, but why another different price and way to buy tthose doses? Where should I buy the right doses?

[Micael]

Both places are valid. In the app I-doser can price them however they feel appropriate, to sell the doses in google music they have to abide by the prices of google music.