name <span class="op">=</span> <span class="st">"member"</span><span class="op">)</span></span>
<span><span class="va">bands_membs_agg_map</span></span>
<span><span class="co">#&gt; $`Rolling Stones`</span></span>
<span><span class="co">#&gt; [1] "Mick"    "Keith"   "Ronnie"  "Bill"    "Charlie"</span></span>
<span><span class="co">#&gt; </span></span>
<span><span class="co">#&gt; $`The Beatles`</span></span>
<span><span class="co">#&gt; [1] "John"   "Paul"   "George" "Ringo"</span></span>
<span><span class