Hey pinder. Good job on your first tracks! For popular entertainer, I would definitely make sure that all the elements are in one specific key as it feels a bit out of key. And for Horizon, I would add transition fx in there like white noise sweeps to glue the track together. For free sounds that would work well in your tracks you can check out our catalog of free downloads! SoundShock | Free loops and samples, Presets, Tutorials, & More