Content Type Fields, populate field with usable data when adding new content
Don't worry you don't need to start again, this is such a common use case there are actually 3 modules out there that you can choose between.


Entity Reference
References (can be considered deprecated in favour of entity reference).
Relation (allows for complex relationships, probably overkill for your case)


All 3 will allow you to add a field to your track content type that references an album node. You can choose from a select list, radio/check buttons or autocomplete widget out-of-the-box but I'm sure there are add-ons available if you need them.