cant add songs to iphone through itunes?

Do you have manually manage music and videos selected under the Summary tab for your iPhone sync preferences?

Do you have an iTunes playlist available?

If so, deselect manually manage music and videos under the Summary tab for your iPhone sync preferences and select Sync Music under the Music tab for your iPhone sync preferences. Choose selected playlists and select the playlist in the window below that you want transferred to your iPhone followed by a sync.

This is to determine if music can be transferred to your iPhone successfully via syncing.

And the problem provided for all 46 is - "song name' was not copied to the iphone because it cannot be played on this iphone'"?

Were these songs imported into your iTunes library from a source other than from the iTunes store? If so, do you know which encoder setting you used for the import - MP3 or AAC, etc.?

Page 197 of the manual:

" Song, Video, or Other Items Won’t Play
The song may have been encoded in a format that iPhone doesn’t support. The
following audio file formats are supported by iPhone. These include formats for
audiobooks and podcasting:

 AAC (M4A, M4B, M4P, up to 320 Kbps)

 Apple Lossless (a high-quality compressed format)

 MP3 (up to 320 Kbps)

 MP3 Variable Bit Rate (VBR)

 WAV

 AA (audible.com spoken word, formats 2, 3, and 4)

 AAX (audible.com spoken word, AudibleEnhanced format)

 AIFF"

http://manuals.info.apple.com/enUS/iPhone_UserGuide.pdf