How do I put songs back into the same album?

[AC Question]

I recently got my Galaxy S6 Edge, and am loving it. It's absolutely fantastic. The other night I tried putting my music from iTunes on it, which was extremely easy since I have a PC. One issue that came up however was that some songs would appear in a separate album than others. Now I have a couple of albums with half the songs on two of the same album. It's really bothering me and I need help. Thanks in advance.