vk_transfer_audio_tracks.js

// This snippet for VK.com adds audio tracks from user page to the group.
// Insert your parameters and execute it multiple times (it copies "count" tracks at time)

// Insert your values here
var user_id=123;
var group_id=456;

// Max requests number per execution is 25
var count = 25-3;

var tracks_total = API.audio.getCount({"owner_id": user_id});
var tracks_added = API.audio.getCount({"owner_id": -group_id});

var offset = tracks_total - tracks_added - count;

var track_list = API.audio.get({"owner_id": user_id,
    "offset": offset, "count": count}).items@.id;

var i = count - 1;
while (i >= 0) {
    API.audio.add({
        "audio_id": track_list[i],
        "owner_id": user_id,
        "group_id": group_id
    });
    i = i - 1;
}

return 1;