Seekbar style for equalizer

seekbar_style.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id="@android:id/background"
        android:drawable="@android:color/transparent" >
    </item>
    <item
        android:id="@android:id/progress" >
        <clip
            android:drawable="@drawable/seekbar_progress" />
    </item>
</layer-list>