The traditional way to move music from Samsung to iPhone would be using USb cable, copy music from the folder in Samsung to iPhone.

You can also transfer via iTunes:
Step 1. Connect Samsung and iPhone to computer via USB cables. Create a new folder on the desktop. Double click “Computer” icon, find Samsung storage under “Portable device”, then copy the songs on Samsung to the new folder.
Step 2. Run iTunes on your computer. On Menu Bar, click “File”, then select “Add Folder to Library…”.
Step 3. A popup will appear. Find and select the new folder created on step 1, click “Select Folder” button on the bottom-right corner.
Step 4. The newly added songs should appear on the library(the default interface of iTunes) now. Under the Menu Bar, click the iPhone icon. There will be an overview of your iPhone. Click “Music” on the left column.
Step 5. There should be an option for syncing music now. Tick after “Sync Music”, then click “Apply” button on the bottom-right corner.
Step 6. You can view the processing bar on the middle area of the top. Check whether all selected musics have been synced to the Music app of your iPhone.

The process of using iTunes is a little complicated, or you can use Gihosoft Phone transfer which is efficiently easy to transfer data between phones.

Thanks op. Good information indeed.

Noted.