anyone knows the title of background songs in the anime?

[Rikha-chan]

especially the one that play in romantic scenes

[snowflake]

I know the main one is called Kimi ga Ireba, I think. About the rest I think if you just write "Detective conan soundtrack" on YouTube you'll find what you're looking for.

[Moonlight Magician]

Osenchi na ayumi?

[Alpha the Errorist]

Ai wa itsumo.( I love this one!)