Free Ondas Alfa Para Concentrarse ringtone for your phone. Listen first, then download the version you like. Artist: Mc_team featuring Ondas Alfa. There are 8 versions, from 15 to 37 seconds long. If you like ambient, new age and slow ringtones, see the tags below. Android users need the .MP3 file, iPhone users need the .M4R file. Both are free. More ringtones by Mc_team are on the artist page, the link is under the title.