On the latest version(s), the app stores the downloaded files to the external SD card (if present - dunno what happens if it isn't present), To get access to the files there, enable viewing of hidden files in your file manager (yes, Show Hidden Files in ES File Explorer), and navigate to the same directory, viz.
External SD Card/Android/data/com.gaana/files/.gaana
and you'll find files with random numbers without any metadata (album artist, album covert art). First, you'll have rename the files by appending a .mp3 extension (for example, filename is 123456, then you have to rename it to 123456.mp3). You can automate this using a file renaming software (File Renamer Basic comes to mind). You'll have to individually figure out which file corresponds to which song and add the metadata yourself, or with any third party app (MediaMonkey claims to be able to do that, though it often does a very poor job of it, then there's a slightly better MusicBrainz Picard). I'd suggest you download the songs yourself through some other means instead of going through all this trouble.
In addition, if you want the cover art for the songs, you can check the same location on the internal memory, but the folder filesApp_Images.
Last edited by zeomal; 21st November 2015 at 08:47 PM.